[HOW-TO] unpack/modify/repack/pack kernels for noobs - Sony Xperia P, U, Sola, Go

Hello, everyone!
This is intended for everyone who want to modify kernels they are using. Since I could not find tutorials on how to repack kernels for our Novathor devices, I decided to write my own tutorial. Maybe there are other ways, but this is how I do it and it is 100% failsafe. I took transcendence CM 1.1.6 kernel as an example in this tutorial. So, let's start!
Requirements:
- Flashtool
- Linux (Ubuntu preferable), you can also use builduntu if you don't want to install linux to your hard drive
- Files provided in attachment
- Not to close terminal in linux at any price
- Brains
STEP 1: Unpacking
First of all, you want to unpack the kernel. This is the easiest one.
Fire up Flashtool, select tools/extractors/elf
Easy, right? Now, click on those three dots and find kernel you wish to modify. Kernel MUST have .elf extension for this to work, so if you have "boot.img" at you disposal, please rename it to "kernel.elf" (without quotes). Once you loaded your kernel, just click unpack. Do not close Flashtool yet. In it you will see logs that kernel is unpacked. Please take a screenshot of that window as we will need that report later. Screenshot should look like this:
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After you have saved screenshot somewhere, look in the folder where your kernel is, and you will find two or three files additional files, sometimes even four, depending on the kernel itself. They should be named this way:
kernel.elf.ramdisk.gz (very rarely, this file may be called kernel.elf.2)
kernel.elf.Image (sometimes this file may be called kernel.elf.1)
kernel.elf.3
kernel.elf.cmd
It depends on the kernel how much files you're going to have. Now, please rename them, so that you delete kernel.elf from names. Now they should be named like this:
ramdisk.gz
Image
3
cmd
Bolded files are needed for our modifications. Now to the next step!
STEP 2: Modifying
Now that we have needed files at our disposal, it's time to do the modifications.
Image file
This file is zImage of the kernel. This is the core of the kernel, where CPU frequencies, drivers, governors, etc. are stored. This file you cannot really modify but if you have built your own specific zImage, you can replace it. I don't recommend touching this file unless you know what you're doing (in other words, unless you're developer or programmer).
So, noobs: don't modify this file; pros: Go ahead
ramdisk.gz
You want to change that sweet boot image, that's why you want to unpack kernel in the first place? On how to create boot image, go here.
This file contains the rest of the tweaks developers apply to kernel. Here you will find CWM, bootsplash image, autoroot files, etc, all depending on kernel you are modifying. Now, hot to unpack this bloody file? some suggest to use 7zip, but this way you will break symlinks and your kernel will definitely not boot. Proper way of unpacking ramdisk.gz goes like this:
First of all, boot up linux (or load builduntu into virtual machine, your choice).
We want to set up working folders, right? Fire up terminal and enter following commands, one line at the time:
mkdir kernel-working
mkdir ramdisk-working
cd ramdisk-working
mkdir ramdisk-contents
cd ramdisk-contents
Click to expand...
Click to collapse
Don't close terminal, or I will break you fingers Now in your home folder you will find folders we've just created. Nice, isn't it? Remember those files we've unpacked earlier? copy them to these folders. ramdisk.gz goes to ramdisk-working folder, while the rest goes to kernel-working folder.
Download kernel_repack.zip from the attachment und unpack files which are in it to kernel-working folder.
Now we're all set up for modifying
Go back to the terminal. Copy and paste following command and run it:
gunzip -c ../ramdisk.gz | cpio -i
Click to expand...
Click to collapse
Again, don't close the terminal. This time I will break your legs if you do so Now ramdisk.gz is unpacked in ramdisk-contents folder (which is in ramdisk-working folder). There you will find bunch of files and folders. After you have done all your modifications, it's time to pack it up. To do so, run the following command in terminal:
find . | cpio -o -H newc | gzip > ../newramdisk.gz
Click to expand...
Click to collapse
In ramdisk-working folder you will find newramdisk.gz file, besides ramdisk.gz. Copy newramdisk.gz to kernel-working folder and rename it to ramdisk.gz.
Now all files for compiling new kernel are prepared. To the next and final step.
STEP 3: Packing kernel back
In terminal, run following commands (and yes, you run cd .. twice in a row):
cd ..
cd ..
cd kernel-working
Click to expand...
Click to collapse
Remember that screenshot we've took earlier? This is where we need it Told you so
And finally, here is the mother of all commands which neatly packs all of our files back into kernel, but don't use it just yet, I will explain why:
sudo python mkelf.py -o kernel.elf [email protected] [email protected],ramdisk [email protected],cmdline
Click to expand...
Click to collapse
Take a look at the my screenshot and you will see that each of the files have its own adress. For example Image is at the adress 0x00008000 and ramdisk.gz is at the adress 0x01000000,ramdisk and 3 is at the adress 0x00000000,cmdline. By writing proper names and adresses, I'm telling computer where to pack files inside the kernel. You will have to change adresses in this command according to your screenshot, because not all kernel have the same adresses for same files. This is the most important step because if you do this wrong, kernel will not properly compile!
If you did all the work correctly, in kernel-working folder you will find new kernel.elf file. If it was named boot.img before editing, rename it back, if it was named kernel.elf then leave as it is. If you want, you can test if you packed kernel properly by trying to unpack it in Flashtool. If flashtool reports that you have some files to unpack, than all is OK, if it reports nothing, then something went wrong.
Ta-da! Your kernel is finally packed and is ready to be flashed to your phone. Hopefully, if you didn't messed up something when you did your modifications and alterations to ramdisk.gz, it should properly boot.
You can flash kernel in your preffered way.
Final words:
I tried to make this tutorial as user-friendly as possible. It is pretty straightforward once you get into it.
I hope that I clarified some thing, and more importantly, that I helped you.
Cheers everyone, and happy, repacking/flashing/modifying

Not a bad guide! Keep it up!
Sent my Carbonised Xperia P

Nice! :good:
Another good reference for kernel unpacking is this: http://forum.xda-developers.com/xperia-u/general/tutorial-explaining-stock-boot-image-t2126924
Enviado desde mi ST25i mediante Tapatalk

great guide

I just have windows , so am i doomed ?? I just wanted to change my kernel to Candy instead of Sony

Johnt880 said:
I just have windows , so am i doomed ?? I just wanted to change my kernel to Candy instead of Sony
Click to expand...
Click to collapse
Run builduntu in virtualbox.

If i got a sony kernel that sorted with the word sony out that will do my phone ?Just a standard kernel

I didn't quite understand you, can you clarify a little?

kernel 4.4.2
is there a way to modify the kernel aosp 4.4.2. This method does not work

kosmos-2011 said:
is there a way to modify the kernel aosp 4.4.2. This method does not work
Click to expand...
Click to collapse
Try that > http://forum.xda-developers.com/showthread.php?t=2073775

Related

[TUTORIAL] How to unpack Android ROMs on Windows

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As all of you well know, Android is an open source operating system and as such the development and modding are the bread and butter for devices with this OS.
In this thread I'll explain how to extract the firmware partition containing the operating system and programs with a Windows PC.
The purpose of this thread is to share knowledge, so feel free to help me to dump device such as Acer, Samsung and Sony Ericsson, expecially I need someone that help me with Acer's .bin
1. Unpack the system partition from an HTC ROM
What you need:
UniExtract: http://legroom.net/software/uniextract (freeware)
ZipScan: http://www.zipscan.co.uk/ (shareware)
Cygwin: http://cygwin.org/setup.exe (freeware)
Unyaffs for Windows: http://goo.gl/z6yI
Download and install all the tools (Unyaffs it's a prompt executable, so it isn't installable)
Now you need an HTC ROM, download one at your pleasure from Conflipper's site: http://www.shipped-roms.com/shipped/
Once you have downloaded it, right click on the ROM executable and select Extract with UniExtract in the subfolder (v.fig1), select Isxunpack extraction and then clik on the OK button (v. fig2)
Now in the subfolder you have the various files which make up the executable, including data1.cab which is the file that we are more interested in (do not delete other files).
Open ZipScan, go to File -> Open Archive File... and browse until select the data1.cab. You should see something like this:
Extract from the cab only the ROM.zip and open this file with any archives extraction software (eg WinRAR or the same ZipScan). Inside you have various .img files which make up the ROM, but for the purposes of this guide, we need only the system.img.
Copy in a blank folder this file, unyaffs.exe and cygwin1.dll (you'll find it in C:\Cygwin\Bin).
Now open Cygwin from Start -> All Programs to ensure that its functions are integrated to the Windows Prompt and close it.
Open the Windows Prompt (Start -> All Programs -> Accessories) and position yourself in the folder containing the files using the cd command or alternatively install this .reg which allow you to open the Windows Prompt in the chosen folder by command in the context menu (Right click on the folder -> Command Prompt Here).
Now the last thing that you have to do is to give the extraction command: unyaffs system.img
Et voilà, now you have the folders containing the extracted system.
Enjoy
2. Unpack the system partition from a Motorola ROM
°°°Coming Soon°°°
°°°reserved°°°
°°°2nd reserved°°°
°°°3rd reserved°°°
Thank you! I had found a different way but this will save some steps.
mark
i will see
!!!!!!!!!!!!!!!!111
Someone once told me you can just run the .exe file, let it open, use windows to search for the rom.zip that would have been extracted into a temp folder, drag&drop to another location, then cancel the .exe again.
Haven't tried this myself though.
What else can you show us in windows?... Is it at all possible to extract ramdisc thingies from kernels so we can apply one custom kernel to other roms ourself?
... or should I bite the bullet and install/learn how to use ubuntu?
Nice initiative. Finish the guides and I'll see to it that it's stickied.
ddotpatel said:
Is it at all possible to extract ramdisc thingies from kernels so we can apply one custom kernel to other roms ourself?
... or should I bite the bullet and install/learn how to use ubuntu?
Click to expand...
Click to collapse
There are simple perl scripts kicking about to unpack/pack boot.img, so you can use them on Windows as long as you install perl first - say either via Cygwin or Active State.
I just used WinRAR to do everything that UniExtract and ZipScan can do.
...so basically you showed me that system.img can be unpacked using the linux command-line utility UnYaffs.exe, which can be run through CygWin. Thanks.
Why doesn't someone make a UnYaffs.exe for windows command line?
After I change things, how to I ReYaffs it to system.img? ...and when I re-zip it don't I have to sign it or something? If I modify an apk do I have to deODEX it first? Do I reODEX after?
I would love a quick tutorial on, say, how to change an icon for an app. Something that shows people who already know how to do this type of stuff a brief step-by-step guide to taking a [ROM], adding and deleting a few apks inside it, making a graphical change to an apk inside it (skinning), and then recooking those changes in to a new [ROM] to be shared with all.
rpmccormick said:
I just used WinRAR to do everything that UniExtract and ZipScan can do.
...so basically you showed me that system.img can be unpacked using the linux command-line utility UnYaffs.exe, which can be run through CygWin. Thanks.
Why doesn't someone make a UnYaffs.exe for windows command line?
After I change things, how to I ReYaffs it to system.img? ...and when I re-zip it don't I have to sign it or something? If I modify an apk do I have to deODEX it first? Do I reODEX after?
I would love a quick tutorial on, say, how to change an icon for an app. Something that shows people who already know how to do this type of stuff a brief step-by-step guide to taking a [ROM], adding and deleting a few apks inside it, making a graphical change to an apk inside it (skinning), and then recooking those changes in to a new [ROM] to be shared with all.
Click to expand...
Click to collapse
No ****... I was wondering why he's making it all so complicated with all these extra tools when I can click the file in Winrar (extract to...) and be done. All in ONE step for me.. LOL
For me it was more than one step because using WinRAR on system.img didn't get all the files out. Using unyaffs did. But now I have a system.img from a new Android tablet and I can't get anything out of it other then the META-INF directory using WinRAR, Unyaffs, or UniExtract. Anyone have any clue how to get in to those?
...and I still want an easy tutorial on how to re-assemble a flashable system.img / update.zip once I change some stuff in there.
I really hope one of those reserved spots is for the newer Samsung phones. What really cheeses me, though, is that I had that explained to me once, and I can't find it, and didn't write it down
I've compiled both unyaffs.exe, mkyaffsimage and mkyaffs2image for cygwin, with the DLL you can use them on Windows too. Sadly, I don't know too much about C and C++, so I can't make it work, but maybe I will try to compile them for Windows, and with some bugfixing, MAYBE it will run.
Samsung did not use the usual yaffs image (for Galaxy S at least), but their own format, what can be easily extracted. I will post some more about it as soon as I get back to windows, recompile the executables and upload them.
i wana extract boot.img , but i have some error
$ gunzip -c boot.img | cpio -i
bash: cpio: command not found
gzip: boot.img: not in gzip format
Click to expand...
Click to collapse
I had some problems with unyaffs. This version posted on 1st page is bugy, if you have same problem try...
hmmm i have i more problem: To prevent spam to the forums, new users are not permitted to post outside links in their messages.
so sry guys i can't help you right now
rpmccormick said:
i just used winrar to do everything that uniextract and zipscan can do.
...so basically you showed me that system.img can be unpacked using the linux command-line utility unyaffs.exe, which can be run through cygwin. Thanks.
Why doesn't someone make a unyaffs.exe for windows command line?
After i change things, how to i reyaffs it to system.img? ...and when i re-zip it don't i have to sign it or something? If i modify an apk do i have to deodex it first? Do i reodex after?
I would love a quick tutorial on, say, how to change an icon for an app. Something that shows people who already know how to do this type of stuff a brief step-by-step guide to taking a [rom], adding and deleting a few apks inside it, making a graphical change to an apk inside it (skinning), and then recooking those changes in to a new [rom] to be shared with all.
Click to expand...
Click to collapse
+1000
.
WinImage can extract the .img.
Unfortunately, I don't think it can repack them properly.

[Q] Need help compiling / building own kernel (zImage)

Hello dev community
I am currently trying to build my own kernel / zImage, but for some reason it doesn't work, when I flash my zImage the SGS2 crashs at the bootscreen with the yellow triangle.
Not even the battery animation when charging while off works anymore *lol*
Here is what I did so far:
extracted a stock initramfs from a samsung stock kernel
got the Samsung kernel sources and extracted on my PC
got the codesourcery toolchain and installed it
edited the path to the toolchain into kernel/Makefile
ran
make c1_rev02_defconfig (as stated in the readme.txt of the src download)
set the path to the extracted iniramfs files in the config
ran
make zImage
It eventually tells me "kernel zImage ready at ...."
padded with 0x00s to the 8MiB size, .tar'ed and flashed via Odin
But it doesn't boot.
When I throw my zImage at the initramfs extractor script, I get the proper initramfs files dumped, so they seem to be fine.
Searched around this forums for two days now, found a few "zImage repacker scripts" but none work or clear up any of my questions.
Any hints on what I missed or did wrong are appreciated
And while we're at it, another question:
At new FW builds, does the actual kernel itself change too, or is it only changes in the initramfs? Because there is only one set of sources from Samsung.... so I assume the actual kernel stays the same and using the initramfs of the targetted FW will suufice?
Why did you pad it up to 8mb?
also, when setting the initramfs source, did you set these to you uid you are compiling with?
CONFIG_INITRAMFS_ROOT_UID=1000
CONFIG_INITRAMFS_ROOT_GID=1000
Hm, padded to 8MB as all kernels are (padded to) 8MB, aren't they?
Tried flashing an unpadded version too, still no go.
And yes, UID and GID are set to the ones my user is running as....
Close to the end of the compiler run, I get a "found 14 module section missmatches" kind of message - could that have something to do with my zImage not working? And how would I fix that?
Oh c'mon, it can't be that hard, so many people are making their own zImages.... what am I missing here.... :-/
First of all, you cant just use a stock initramfs image, shove it into another kernel and expect it to work. There are kernel modules in there which need to be updated first before you do the last "make zImage".
Try this:
0. make sure your config is correct. you should copy c1_rev02_defconfig from inside arm/ to source_root/.config and do a "make oldconfig". Then adjust your configs as necessary ("make menuconfig" etc)
1. "make modules"
2. "INSTALL_MOD_PATH=~ make modules_install"
3. goto your home dir and pick out the modules and put them into the path of your initramfs files (/lib)
4. finally, make zImage.
5. theres no need to pad to 8mb. that is an urban legend
OK, did all that.... still no go.... :-/
Try this script:
Code:
#!/bin/bash
# Set Default Path
TOP_DIR=$PWD
KERNEL_PATH=/home/neophyte-x360/kernel/GALAXYS2/2.6.35.7
# TODO: Set toolchain and root filesystem path
TAR_NAME=zImage.tar
TOOLCHAIN="/home/neophyte-x360/android/system/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/arm-eabi-"
# TOOLCHAIN="/home/neophyte-x360/toolchain/bin/arm-none-eabi-"
ROOTFS_PATH="/home/neophyte-x360/kernel/GALAXYS2/initramfs-SGS2"
echo "Cleaning latest build"
make ARCH=arm CROSS_COMPILE=$TOOLCHAIN -j`grep 'processor' /proc/cpuinfo | wc -l` clean
cp -f $KERNEL_PATH/arch/arm/configs/c1_rev02_defconfig $KERNEL_PATH/.config
make -j4 -C $KERNEL_PATH oldconfig || exit -1
make -j4 -C $KERNEL_PATH ARCH=arm CROSS_COMPILE=$TOOLCHAIN || exit -1
cp drivers/bluetooth/bthid/bthid.ko $ROOTFS_PATH/lib/modules/
cp drivers/net/wireless/bcm4330/dhd.ko $ROOTFS_PATH/lib/modules/
cp drivers/samsung/j4fs/j4fs.ko $ROOTFS_PATH/lib/modules/
cp drivers/samsung/fm_si4709/Si4709_driver.ko $ROOTFS_PATH/lib/modules/
cp drivers/scsi/scsi_wait_scan.ko $ROOTFS_PATH/lib/modules/
cp drivers/samsung/vibetonz/vibrator.ko $ROOTFS_PATH/lib/modules/
make -j4 -C $KERNEL_PATH ARCH=arm CROSS_COMPILE=$TOOLCHAIN || exit -1
# Copy Kernel Image
cp -f $KERNEL_PATH/arch/arm/boot/zImage .
cd arch/arm/boot
tar cf $KERNEL_PATH/arch/arm/boot/$TAR_NAME zImage && ls -lh $TAR_NAME
And try with other initramfs, maybe could be this.
PD: I forgot that with my script you have to select your initramfs inside .config
Very interesting thread!
Im about to study computer science and software engineering for 3 years in august.
Hoping/wishing/expecting to get into this eventually!
put this in your build script:-
export LOCALVERSION="-I9100XWKE7-CL215725"
this is just an example set its value to the same as the initramfs you used, e.g. the magicver in the modules.
sounds like your initramfs are incomplete...or more likely your toolchain is not quite right. even without recovery, your zimage should be 6-7mb...(no padding, and there is no need to)
OK, done a clean rebuild, taking care of everything you guys said:
made new initramfs dump from a stock zImage
make mrproper
make c1_rev02_defconfig
make menuconfig - set the paths/prefixes for toolchain, localversion and initramfs (also set my users UID and GID for mapping to UID/GUI 0) there, left everything else untouched and at defaults
make
copied the freshly built modules into my initramfs dir (checked with a hexeditor for the proper versionmagic, looks OK)
make zImage
resulting zImake size: ~5.7MB and no go, still doesn't boot.
I'll try now with another toolchain (using the last one available for d/l so far, just got the 2009-something one mentioned in the sources readme and going to try to use that one now) as well as different initramfs dumper....
I have not much hope this will change the outcome, but it's at least worth a try....
// EDIT (a few hours later xD)
SUCCESS
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(anyone knows what the #9 is? where it comes from, what it says?)
I *finally* managed to get a completely self built kernel to boot \o/
So, what was it that played showstopper the whole time: THE TOOLCHAIN!
I had the latest (2011-something) version of the CodeSourcery toolchain installed - that does not seem to be a good idea.
Did exactely what I did before, but now with the 2009q3 version installed (like the readme of the source states) - and tadaa, it works!
// EDIT 2
Figured out the #9 as well, it's the build number / version; how many times I ran "make" since the last "make mrproper"
LET THE MODDING BEGIN (now the fun starts)
Glad to see someone's happy. I'm also trying to compile a kernel from source. However, mine's an I9100G. Managed to compile, flash and boot up my phone, but battery status and Wifi don't work. After looking through the dmesg log, apparently the battery driver is not being initialised. I wonder if anyone can help me? Maybe someone with knowledge of the OMAP platform?
aidfarh said:
Glad to see someone's happy. I'm also trying to compile a kernel from source. However, mine's an I9100G. Managed to compile, flash and boot up my phone, but battery status and Wifi don't work. After looking through the dmesg log, apparently the battery driver is not being initialised. I wonder if anyone can help me? Maybe someone with knowledge of the OMAP platform?
Click to expand...
Click to collapse
You can give me initramfs?
I cqn give it a try.
Sent from my GT-I9100
How to
HellcatDroid said:
Hello dev community
I am currently trying to build my own kernel / zImage, but for some reason it doesn't work, when I flash my zImage the SGS2 crashs at the bootscreen with the yellow triangle.
Not even the battery animation when charging while off works anymore *lol*
Click to expand...
Click to collapse
Could you please give a few mn to write a min How To? I would like to build my own, but as a noob, I am a litle lost in all the info I gathered.
It would be nice to profit from your experience.
Or maybe do you have any good links?
TY
netchip said:
You can give me initramfs?
I cqn give it a try.
Sent from my GT-I9100
Click to expand...
Click to collapse
Well, if you think it can help, here's the download link for my initramfs:
http://dl.dropbox.com/u/13796854/initramfs.zip
It's for an I9100G, though. Do you have one to test with?
aidfarh said:
Well, if you think it can help, here's the download link for my initramfs:
http://dl.dropbox.com/u/13796854/initramfs.zip
It's for an I9100G, though. Do you have one to test with?
Click to expand...
Click to collapse
I haven't one for testing.
I am a kernel developer here for SGS2, check the development part.

[Tutorial] How to change kernel logo (1st boot srceen) [COMPLETED]

We have 3 major works here... So I gonna to make it seperated
-1st post is HOW TO EXTRACT kernel.img (boot.img)
-2nd post is HOW TO CONVERT PICTURE FILE to BOOT.RLE
-3rd post is HOW TO REPACK THE KERNEL PAKAGE into boot.img
Requiredment
-Window machine
-installed cygwin
-the full boot.img/kernel (some kernel won't work because there is no full pakage/ i mean we can't)
-bootimg.zip (tool for UNPACK and REPACK kernel)
-boot_screen_logo_creation_package.rar
Thank and Credit
i- Credit to DooMLoRD Recognized Developer over most of XPERIA devices for his own tool and tutor that I learned before
ii- Credit to jimbo77 Senior Member for his tutorial that I used and learned and tool for unpack and repack
ii- Don't forget to give them a thanks meter
=============================================================================
Here we go
1-This section I will show u how to unpack and repack the boot.img
just see from original thread by jimbo77 from here and download the UNPACK and REPACK tool by him HERE
this is a fast guide from me:-
1-extract the bootimg-tools.zip into new folder (name it 'boot' folder)
2-move it into cygwin directory (cygwin/boot)
3- move your fav kernel into same directory
4-run cygwin.bat
cd /boot
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5-Now, unpack your boot.img by running the following command:
./extractboot boot.img
Click to expand...
Click to collapse
If your output looks like this, then the extraction has worked correctly! Note that the Command Line string has also been read from the source file, this will be used later when you go to re-pack your file.
Your script folder should now look like this:
boot.img-kernel is the compiled kernel blob that was inside the source boot.img, if you want to replace the kernel with another compiled kernel image, you can replace this file with another one (but leave the file name the same)
boot.img-ramdisk.gz is the gzipped ramdisk image which has been split from the boot.img, you should leave this file alone.
The “out” folder contains the EXTRACTED ramdisk, and this is where you should make your changes to the ramdisk.
Important Note!
Remember, when editing files in the ramdisk through Windows, such as init.rc, Windows notepad will not format the files correctly, making them almost impossible to read, wheras Wordpad will LOOK like it is formatting the files correctly, if you save one of these files from the Wordpad application it will BREAK the file and it will no longer be able to be read correctly by Android. To edit these files you MUST use an editor such as Notepad++ which you can download for free.
AGAIN...
Special thanks/credit to jimbo77 for his excellent guide
So.. NEXT step to change a kernel logo is here
Requiredment
1-a picture what are u like to look into the 1st boot screen (kernel logo) (make sure it size/resolution same your device resolution)
2-boot_screen_logo_creation_package.rar
3-some infos and knowledges here
4-window machine like i explained on 1st post
My quick guide
-extract the tool.rar
-move extracted files into new folder (name it 'rle' folder without quote)
-move into cygwin folder (to make it easy to follow my simple guide)
-copy your own logo.png (a picture u want to use on a kernel) into same rle folder
(for 4 steps above it shold look like tis)
-now launch cygwin.bat
cd /rle
Click to expand...
Click to collapse
./convert_image_to_rle.bat logo.png
Click to expand...
Click to collapse
Ah...my mistake..don't forget to move/copy/replace new logo.rle into
C/cygwin/boot/out/ramdisk/here
if you done good...follow next step on next post (to repack your moded kernel)
Last step before you flash a new look kernel (boot.img) is
Repack your moded kernel
./packboot
Click to expand...
Click to collapse
One thing to note that people may mention in other guides, is that when packing boot.img files, you will usually have to declare a base address, and a command line to the packaging tool. This set of scripts reads the existing command line and base address from the boot.img file you originally provided at the time of repacking, so always make sure you leave your original source boot.img file in the folder and do not re-name it after extraction, your newly created boot.img file will be named boot_new.img and will NOT overwrite the original.
Done! If your screen looks like the image above, then you should now have a freshly created boot_new.img file, ready to be flashed to Android for testing, you can now go ahead and flash it through FASTBOOT one thing I'll recommend though is to first do
I need this for extra (extra thanks..)
(may U?)
nelikp said:
I need this for extra (extra thanks..)
(may U?)
Click to expand...
Click to collapse
ähem lol thats not needed...?
jader13254 said:
ähem lol thats not needed...?
Click to expand...
Click to collapse
hahahahaa
Happy theme-ing
Thanks for the tutorial, I think I'll try this at the weekend just for fun. :good:
Nice tutorial, almost n00b proof. But I use kernel kitchen instead of cygwin. ?
Sent from my LT15i using xda premium
datagubben said:
Nice tutorial, almost n00b proof. But I use kernel kitchen instead of cygwin. ?
Sent from my LT15i using xda premium
Click to expand...
Click to collapse
Seriously ??? Whats This?
$ ./extractboot boot_9.587c.IMG
./extractboot: ./split_bootimg.pl: /usr/bin/perl: bad interpreter: Permission denied
./extractboot: line 17: cpio: command not found
gzip: ../../boot.img-ramdisk.gz: No such file or directory
Click to expand...
Click to collapse
YeoZy96 said:
Seriously ??? Whats This?
Click to expand...
Click to collapse
What kernel? Give me the link kernel
YeoZy96 said:
Seriously ??? Whats This?
Click to expand...
Click to collapse
What kernel? Give me the link kernel
nelikp said:
What kernel? Give me the link kernel
Click to expand...
Click to collapse
https://forum.xda-developers.com/showpost.php?p=31910339&postcount=2304
nelikp said:
We have 3 major works here... So I gonna to make it seperated
-1st post is HOW TO EXTRACT kernel.img (boot.img)
-2nd post is HOW TO CONVERT PICTURE FILE to BOOT.RLE
-3rd post is HOW TO REPACK THE KERNEL PAKAGE into boot.img
Requiredment
-Window machine
-installed cygwin
-the full boot.img/kernel (some kernel won't work because there is no full pakage/ i mean we can't)
-bootimg.zip (tool for UNPACK and REPACK kernel)
-boot_screen_logo_creation_package.rar
Thank and Credit
i- Credit to DooMLoRD Recognized Developer over most of XPERIA devices for his own tool and tutor that I learned before
ii- Credit to jimbo77 Senior Member for his tutorial that I used and learned and tool for unpack and repack
ii- Don't forget to give them a thanks meter
=============================================================================
Here we go
1-This section I will show u how to unpack and repack the boot.img
just see from original thread by jimbo77 from here and download the UNPACK and REPACK tool by him HERE
this is a fast guide from me:-
1-extract the bootimg-tools.zip into new folder (name it 'boot' folder)
2-move it into cygwin directory (cygwin/boot)
3- move your fav kernel into same directory
4-run cygwin.bat
5-Now, unpack your boot.img by running the following command:
If your output looks like this, then the extraction has worked correctly! Note that the Command Line string has also been read from the source file, this will be used later when you go to re-pack your file.
Your script folder should now look like this:
boot.img-kernel is the compiled kernel blob that was inside the source boot.img, if you want to replace the kernel with another compiled kernel image, you can replace this file with another one (but leave the file name the same)
boot.img-ramdisk.gz is the gzipped ramdisk image which has been split from the boot.img, you should leave this file alone.
The “out” folder contains the EXTRACTED ramdisk, and this is where you should make your changes to the ramdisk.
Important Note!
Remember, when editing files in the ramdisk through Windows, such as init.rc, Windows notepad will not format the files correctly, making them almost impossible to read, wheras Wordpad will LOOK like it is formatting the files correctly, if you save one of these files from the Wordpad application it will BREAK the file and it will no longer be able to be read correctly by Android. To edit these files you MUST use an editor such as Notepad++ which you can download for free.
AGAIN...
Special thanks/credit to jimbo77 for his excellent guide
Click to expand...
Click to collapse
nice tutorial...how about working with ftf (kernel.ftf) can u make tutorial?
YeoZy96 said:
https://forum.xda-developers.com/showpost.php?p=31910339&postcount=2304
Click to expand...
Click to collapse
I can't pm u..
ad me
Android Magic Header ?
Code:
$ ./extractboot boot.img
Android Magic not found in ./boot.img. Giving up.
gzip: ../../boot.img-ramdisk.gz: No such file or directory
cpio: premature end of archive
Rom
Doesn't work for me :/ Can everyone make it from this kernel : forum.xda-developers.com/attachment.php?attachmentid=916452&d=1330029354 The ICS (SONY) logo? please
just want change to the old SE boot logo
nelikp said:
What kernel? Give me the link kernel
Click to expand...
Click to collapse
how to get boot.img from kernel
---------- Post added at 07:46 PM ---------- Previous post was at 07:40 PM ----------
anishkrsuman said:
how to get boot.img from kernel
Click to expand...
Click to collapse
plz make me clear how to get boot.img from any kernel and after that where to put them??
On windows using cygwin:good:
---------- Post added at 07:52 PM ---------- Previous post was at 07:46 PM ----------
nelikp said:
What kernel? Give me the link kernel
Click to expand...
Click to collapse
plz make this kernel with sony ericsson default logo
http://minicm.googlecode.com/files/E15_nAa-14_2.6.29.6-nAa-14.ftf
The main thing here is how you can successfully install cygwin . I see a lot of people get stuck with this software. You can follow the guide by jimbo77 (as mention in first post) for some error.
I think no one can do help for changing kernel logo.Because it's not right for kernel's owner
YeoZy96 said:
Seriously ??? Whats This?
Click to expand...
Click to collapse
install perl & cpio package in cygwin installer & run as admin

[Tutorial] How to change kernel logo (1st boot srceen) [COMPLETED]

We have 3 major works here... So I gonna to make it seperated
-1st post is HOW TO EXTRACT kernel.img (boot.img)
-2nd post is HOW TO CONVERT PICTURE FILE to BOOT.RLE
-3rd post is HOW TO REPACK THE KERNEL PAKAGE into boot.img
Requiredment
-Window machine
-installed cygwin
-the full boot.img/kernel (some kernel won't work because there is no full pakage/ i mean we can't)
-bootimg.zip (tool for UNPACK and REPACK kernel)
-boot_screen_logo_creation_package.rar
Thank and Credit
i- Credit to DooMLoRD Recognized Developer over most of XPERIA devices for his own tool and tutor that I learned before
ii- Credit to jimbo77 Senior Member for his tutorial that I used and learned and tool for unpack and repack
ii- Don't forget to give them a thanks meter
=============================================================================
Here we go
1-This section I will show u how to unpack and repack the boot.img
just see from original thread by jimbo77 from here and download the UNPACK and REPACK tool by him HERE
this is a fast guide from me:-
1-extract the bootimg-tools.zip into new folder (name it 'boot' folder)
2-move it into cygwin directory (cygwin/boot)
3- move your fav kernel into same directory
4-run cygwin.bat
cd /boot
Click to expand...
Click to collapse
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
5-Now, unpack your boot.img by running the following command:
./extractboot boot.img
Click to expand...
Click to collapse
If your output looks like this, then the extraction has worked correctly! Note that the Command Line string has also been read from the source file, this will be used later when you go to re-pack your file.
Your script folder should now look like this:
boot.img-kernel is the compiled kernel blob that was inside the source boot.img, if you want to replace the kernel with another compiled kernel image, you can replace this file with another one (but leave the file name the same)
boot.img-ramdisk.gz is the gzipped ramdisk image which has been split from the boot.img, you should leave this file alone.
The “out” folder contains the EXTRACTED ramdisk, and this is where you should make your changes to the ramdisk.
Important Note!
Remember, when editing files in the ramdisk through Windows, such as init.rc, Windows notepad will not format the files correctly, making them almost impossible to read, wheras Wordpad will LOOK like it is formatting the files correctly, if you save one of these files from the Wordpad application it will BREAK the file and it will no longer be able to be read correctly by Android. To edit these files you MUST use an editor such as Notepad++ which you can download for free.
AGAIN...
Special thanks/credit to jimbo77 for his excellent guide
So.. NEXT step to change a kernel logo is here
Requiredment
1-a picture what are u like to look into the 1st boot screen (kernel logo) (make sure it size/resolution same your device resolution)
2-boot_screen_logo_creation_package.rar
3-some infos and knowledges here
4-window machine like i explained on 1st post
My quick guide
-extract the tool.rar
-move extracted files into new folder (name it 'rle' folder without quote)
-move into cygwin folder (to make it easy to follow my simple guide)
-copy your own logo.png (a picture u want to use on a kernel) into same rle folder
(for 4 steps above it shold look like tis)
-now launch cygwin.bat
cd /rle
Click to expand...
Click to collapse
./convert_image_to_rle.bat logo.png
Click to expand...
Click to collapse
Ah...my mistake..don't forget to move/copy/replace new logo.rle into
C/cygwin/boot/out/ramdisk/here
if you done good...follow next step on next post (to repack your moded kernel)
Last step before you flash a new look kernel (boot.img) is
Repack your moded kernel
./packboot
Click to expand...
Click to collapse
One thing to note that people may mention in other guides, is that when packing boot.img files, you will usually have to declare a base address, and a command line to the packaging tool. This set of scripts reads the existing command line and base address from the boot.img file you originally provided at the time of repacking, so always make sure you leave your original source boot.img file in the folder and do not re-name it after extraction, your newly created boot.img file will be named boot_new.img and will NOT overwrite the original.
Done! If your screen looks like the image above, then you should now have a freshly created boot_new.img file, ready to be flashed to Android for testing, you can now go ahead and flash it through FASTBOOT one thing I'll recommend though is to first do
I need this for an extra (extra thanks maybe)
(may U?)
great work man
:laugh:
i got this eror what to do?
Theliakos said:
i got this eror what to do?
Click to expand...
Click to collapse
run as administrator
Thanks for this tutorial. But how about when the ramdisk is lzma? I tried changing commands from extractboot and packboot (from "gzip.... " to "lzma........." ) everything works well, the phone boots, but I don't have recovery mode anymore. In rest the kernel is perfect. But I need recovery mode, for installing things. I guess changing the command "gzip - or gunzip, whatever" to "lzma" is not all I have to modify. Any chance for a help?:crying:
LaShto34 said:
Thanks for this tutorial. But how about when the ramdisk is lzma? I tried changing commands from extractboot and packboot (from "gzip.... " to "lzma........." ) everything works well, the phone boots, but I don't have recovery mode anymore. In rest the kernel is perfect. But I need recovery mode, for installing things. I guess changing the command "gzip - or gunzip, whatever" to "lzma" is not all I have to modify. Any chance for a help?:crying:
Click to expand...
Click to collapse
same problem
Nice and awesome tutorial brother! :good::fingers-crossed::highfive:
Deleted
yamin8000 said:
same problem
Click to expand...
Click to collapse
Finally. I made it. For lzma ramdisks use this http://forum.xda-developers.com/showthread.php?t=1659584&highlight=lzma but I modified it to something like this (see attachment). All credits must go to the original developer, I only changed some "gzip -c" word to "lzma -dc". And I managed to modify any kernel with lzma compressed ramdisk. :good:
LaShto34 said:
Finally. I made it. For lzma ramdisks use this http://forum.xda-developers.com/showthread.php?t=1659584&highlight=lzma but I modified it to something like this (see attachment). All credits must go to the original developer, I only changed some "gzip -c" word to "lzma -dc". And I managed to modify any kernel with lzma compressed ramdisk. :good:
Click to expand...
Click to collapse
So all the step is the same with the one on the OP except we need to change gzip -c into lzma -dc?
Sent from my ST15i using xda premium
Singgih4050 said:
So all the step is the same with the one on the OP except we need to change gzip -c into lzma -dc?
Click to expand...
Click to collapse
Yes, but unfortunately it doesn't work with this tutorial (at least for me, because I lost recovery - In rest the kernel behaves normal, but we all need cwm recovery). It only fully works (again, for me) with that modified version of android kernel kitchen 0.3.1.
Will this method work with LOCKED bootloader?
mine can't be unlocked
No it will not working because this is tutorial about to change a kerenl bootlogo (Sony Ericsson) word on startup phone..
Your phone cant be unlocked and no chance to change/flash custom kernel with custom bootlogo.
GSUKeitarou said:
Will this method work with LOCKED bootloader?
mine can't be unlocked
Click to expand...
Click to collapse
---------- Post added at 03:46 AM ---------- Previous post was at 03:45 AM ----------
Good job mate :good:
works for me after i edit bootlogo for Xperia play kernel by doomlord and i managed to enter cwm
LaShto34 said:
Finally. I made it. For lzma ramdisks use this http://forum.xda-developers.com/showthread.php?t=1659584&highlight=lzma but I modified it to something like this (see attachment). All credits must go to the original developer, I only changed some "gzip -c" word to "lzma -dc". And I managed to modify any kernel with lzma compressed ramdisk. :good:
Click to expand...
Click to collapse
thanks for the guide:fingers-crossed:
Al ok but phone not booting after bootlogo changed!!!!
Code:
[email protected] /boot
$ ./extractboot boot.img
Page size: 2048 (0x00000800)
Kernel size: 5920144 (0x005a5590)
Ramdisk size: 4617107 (0x00467393)
Second size: 0 (0x00000000)
Board name:
Command line: androidboot.hardware=qcom user_debug=31 msm_rtb.filter=0x3F ehci-h
cd.park=3 vmalloc=400M androidboot.emmc=true
Writing boot.img-kernel ... complete.
Writing boot.img-ramdisk.gz ... complete.
13874 blocks
[email protected] /boot
$ ./packboot
Using base address 0x80200000
Using command line 'androidboot.hardware=qcom user_debug=31 msm_rtb.filter=0x3F
ehci-hcd.park=3 vmalloc=400M androidboot.emmc=true'
[email protected] /boot
$
Whas is my erros?? My phone can't booting after flash boot.img (new), i don't change bootlogo, only unpack and repack .Thank for help
But now WORK when i change with android kitchen =))
I've been getting this error. I'm already run as administrator. What's the problem?

Extract system.new.dat of Nougat and Marshmallow (easily)

IMP NOTE : Use " python-2.7.xx" ,latest version otherwise extractor will led to undesired output like this one https://forum.xda-developers.com/showpost.php?p=72165633&postcount=295 and extractor supports android 7.1.2(updated on 18-May-2017)
Extractor of system.new.dat of Marshmallow and Lollipop ROM's
​
{
"lightbox_close": "Close",
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"lightbox_error": "The requested content cannot be loaded. Please try again later.",
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"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
DOWNLOAD
OLD
Extractor 1.0
or
Mirror
Extractor 2.0
Extractor 3.0
UPDATED
Extractor 4.8 (Updated on 18-May)
SOURCE
$GIT-HUB Contribute!
Changelog -> https://github.com/matriex/System_Extractor-WIN/commit/4b94cde74f63f6f1ff21b8c745b306326b15cb5a
Alternative of repack, if the repack script doesn't works with your system folder then try this script SCRIPT / GUIDE
How to
Extract ext4-Image files
Download Imgextractor.exe binary from the link
https://github.com/matriex/System_Extractor-WIN/blob/master/bin/Imgextractor.exe
1. Create a folder named ext and copy the binary to ext folder
2. Copy your image file ,say "system_1.img" to ext folder
3. Select the ext folder , hold the shift (right) click RMB
4. Select "Open command window here"
5. Then type this command on CMD
Code:
Imgextractor.exe system_1.img -i
6. The files will be in "system_" named folder.
NOTE:You should rename IMG file to system_1.img before doing anything
Extract *.DAT files
Users, The extractor works with nought 7.0.0 and 7.1.1 perfectly (tested with CM14.1-2016-12-12 & aosp_7.0_2016-09-19), If you encounter errors then please install python and then try extracting again
Method I
Download and run the extractor .
METHOD II (command line)
Use python 2.7.xx
1. Download zip and extract sdat2img.py binary from the link
https://github.com/xpirt/sdat2img/archive/master.zip
2. Create a folder "ext"
3. copy "sdat2img.py", "system.transfer.list" and "system.new.dat" to ext folder
4. Open cmd on "ext", (by selecting and holding shift , you will find "Open command window here")
5.Type this on command window
Code:
python sdat2img.py system.transfer.list system.new.dat system.img
6. After that you'll find system.img on that folder, that image file is ext4 image file and can be extracted by this guide
http://forum.xda-developers.com/showthread.php?t=2285831
END OF SUPPORT I DON'T HAVE ANY METHODS LEFT AND PLESE ASK PROBLEMS RELEATED TO ANDROID 6.0 ONLY
Repack *.DAT
/*Repack will or will not work, Don't panic if it not worked, You can still use folder =) */
For flashing xyz_ROM.zip with dat files , you need to modify updater-script
Script, "of some roms" , b'coz some roms contains a link b/w updateR-script
and system.transfer.list. The link includes following : There is a line in
updateR-script script called
Code:
if range_sha1("/dev/block/platform/msm_sdcc.1/by-name/system", "36,0,32770,......,307199") == "0b20303394271424267e36a0ce7573f1b62ddc0d" then
if you found this in
updateR-script then from here follow the guide Repack_INFO.txt otherwise
directly copy system.new.dat and system.transfer.list to ROM folder and
repack/zip it and flash it.
Repack ,select from script, then choose manually (option 1)
Copy all your ROM files/subfolders(bin ,app ,build.prop etc) to system folder
Everything is expalined in extractor, read it carefully
If you found "range_sah1()" on your updateR-script then continue below, else only you have to replace system.new.dat and system.transfer.list of "xyz_ROM"
CONTINUE ONLY IF YOU FOUND RANGE RANGE_SHA1
After repack a SHA1_VALUE of system.new.dat is generated and file is created as "SHA1_VALUE.txt" with "system.new.dat" & "system.transfer.list"
And follow this guide Repack_INFO.txt (attached end of this POST)
OR GIT ATTACHEDhttps://github.com/matriex/System_Extractor/blob/master/Repack_INFO.md
That's all if you need help feel free to comment
Thanks for using this method I can't say it will work , but what's wrong in trying , I tried 10 to 20 times to make it work
A LITTLE ADVICE
1. If the script failed to work ,please take a look at this post again I'm sure I've posted enough resource which will help you out in extracting and repacking .DAT files .
2. Please keep this thread clean.
3. Please don't quote whole thread(use tags).
4. I take no responsibility of repacking system.img!
5. For Linux users :https://github.com/matriex/System_Extractor-Linux/blob/master/README.md
6. Use Python 2.7.x or otherwise extractor will not work Do not use python 3.0 or update sdat2img.py binary!
Thanks to @xpirt for sdt2img
Repack_INFO.txt (GIT-HUB, clear view)
Any possible way to put it back?
? if possible Or why don't you flash it directly by folder
matrixex said:
Wait comming soon if possible
Or why don't you flash it directly by making some changes in updater-script
Click to expand...
Click to collapse
I am in no dire need of it right away, I am just asking for any future need.
nicesoni_ash said:
I am in no dire need of it right away, I am just asking for any future need.
Click to expand...
Click to collapse
Hi
I have successfully created repack script for system to dat , download it and reply worked or not
Deleted
Deleted
Works well on new Nutella OTA images. Thx
tweakradje said:
Works well on new Nutella OTA images. Thx
Click to expand...
Click to collapse
Cool please give me the link to android N OTA
Sure. Here you go http://developer.android.com/preview/download-ota.html
Cheers
tools not working broo
Source
Tools not working bro
Thanks. Tested and it worked.
v3ndul said:
Tools not working bro
Click to expand...
Click to collapse
Impossible i have tried it with marshmallow and Lollipop system.new.dat files several times(truly 4-5 ROMS more than 10times) it worked without any issues please be sure that you have copied your files as stated and also match the names as stated in extractor.
Don't copy whole post just use HIDE
v3 doesnt work. when I open it (with admin rights) I see the copyright and warnings then it closes and opens a new windows. it does that again and again sort of like a loop
Abaddon said:
v3 doesnt work. when I open it (with admin rights) I see the copyright and warnings then it closes and opens a new windows. it does that again and again sort of like a loop
Click to expand...
Click to collapse
same here
edit: solved using this version
View attachment 3692066
kenzolo said:
same here
edit: solved using this version
View attachment 3692066
Click to expand...
Click to collapse
Abaddon said:
v3 doesnt work. when I open it (with admin rights) I see the copyright and warnings then it closes and opens a new windows. it does that again and again sort of like a loop
Click to expand...
Click to collapse
I am really sorry this is because i converted bat file to exe file
Just uploaded a new version of v3.0 just download it
And you will get two things
1 bin
2 system_extractor.bat
Just run system_Extractor and enjoy
v3ndul said:
Tools not working bro
Click to expand...
Click to collapse
Don't quote the op.
Hi,
I've managed to extract, but repacking is giving the following error:
Found System FOLDER
Creating filesystem with parameters:
Size: 2147483648
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 8192
Label:
Blocks: 524288
Block groups: 16
Reserved block group size: 127
error: ext4_allocate_best_fit_partial: failed to allocate 584 blocks, out of space?
Click to expand...
Click to collapse
I double checked, and I haven't ran out of disk nor RAM.
Can you help me?
Thanks
pacacc said:
Hi,
I've managed to extract, but repacking is giving the following error:
I double checked, and I haven't ran out of disk nor RAM.
Can you help me?
Thanks
Click to expand...
Click to collapse
No bro you haven't ran out of disk or RAM :silly:
This problem persist due to size of your system folder i.e it must be greater than 2GB
Right?
Don't worry jusy edit my batch file code using notepad ++
Here which line you have to edit
Search this line
bin\make_ext4fs.exe -s -l 2048M system.img system
Now replace 2048M with 4096M
After that the line will look like
bin\make_ext4fs.exe -s -l 4096M system.img system
And after that save it.
Done
Reply it worked or not
EDIT ON 30/5/2016
Use new version 4.0 IT CAN CALCULATE SIZE AUTOMATICALLY NO NEED TO EDIT SCRIPT
thanks for sharing this
i'm done the following
1. unpack
2. editing system file content(replace & delete)
3. repack (without error)
4. copy 2 file (system.new.dat & sistem.transfer.list) through 7zip
is that the correct steps? i mean, after that i can flash it like other rom zip

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