Error mounting /sdcard! - Sony Xperia P, U, Sola, Go

cant mount or format internal flash
was at formatting the internal flash when suddenly the phone crashed
now i dont have any rom installed and the kernel says cant mount /sdcard
the only thing i can do now is change kernels(via fastboot) and acces the recovery menus

i know its too early for a bump but it would be nice if my phone gonna work in the next 3 hours cuz i need it at my work and school
thx

bump

You have to give more details which phone... rom kernel... not much details thats may be no answer

xperia s
no rom
kernel cwm 14, or doomkernel i can switch them at anytime

http://forum.xda-developers.com/showthread.php?p=31767259#post31767259
Look at my thread, I have had that problem before but I fixed it.

tommyvirus said:
cant mount or format internal flash
was at formatting the internal flash when suddenly the phone crashed
now i dont have any rom installed and the kernel says cant mount /sdcard
the only thing i can do now is change kernels(via fastboot) and acces the recovery menus
Click to expand...
Click to collapse
were the same problem..my ony xps cant connect to the sd card after upgrading the cwm recovery..pls share it to me if you fix it or you find solution..thanks

jemju_xps-user said:
were the same problem..my ony xps cant connect to the sd card after upgrading the cwm recovery..pls share it to me if you fix it or you find solution..thanks
Click to expand...
Click to collapse
I had the same problem. Solved.it by flashing.xsx kernel. I think its just that you need.to reflash kernel with fastboot.
Sent from my LT26i using xda app-developers app

gallardo5 said:
I had the same problem. Solved.it by flashing.xsx kernel. I think its just that you need.to reflash kernel with fastboot.
Sent from my LT26i using xda app-developers app
Click to expand...
Click to collapse
yes also already fix my xps..try this..
1.download xps ics rom(.ftf must be 600+mb)
2.download the latest flashtool (v0.9.7) then install
3.copy .ftf(ics rom) then paste in the C:\Flashtool\firmwares
4. goto C:\Flashtool\drivers then run then mark "xperia s for ics, fastboot driver and flashboot driver"
5.goto C:\Flashtool\ then select flashtool64 if your comp is 64bits,
6.click the thunderbolt at the left side then mark flashmode
7.select lt26i then ok then do not touch anything just wait to flash until a dialog bo will pop up to connect your device
8.turn off you xps then trigger in flashmode by pressing vol+ then power, release the the two keys until green led light
9.wait to flash the stock ics
10. if finished disconnect your xps then reboot (note:first reboot it takes to long)
11.enjoy stock ics rom

Related

[ HELP ] Bricke'd!

I belive i bricked my phone i tried to flash a custom rom onto it and, my phone keys light up, on the bottom yet my screen shuts off after (LG) main boot and CWM-based Recovery v4.0.1.5
I did a little research and everything seems to point to [APP] Flash Image GUI.
I plug my phone into my pc via USB, and it connects and all but yet im unable to get into my phone to use adb push commands?
I need to figure out how to get my computer to recognize my phone.
And then how to use adb to push the Flash Image GUI to see my screen, any ideas to help?
Just search you are not the first one that bricked the phone. If u cant access recovery u have to use kdz but read the guide otherwise u gonna brick your phone for real...
Sent from my LG-P500H using XDA App
My usb to pc will not connect and I tried using
> mounts and storage > mount USB storage
And it says " E: Unable to open ums lunfile (No such file or directory)
Can you access recovery? If so then your phone is 100% not bricked just wipe everything ( except sd card) and flash your rom again make sure the rom you are flashing is compatible with your phone and the file is not corrupted.
Sent from my LG-P500 using Tapatalk
sachin kamboj said:
Can you access recovery? If so then your phone is 100% not bricked just wipe everything ( except sd card) and flash your rom again make sure the rom you are flashing is compatible with your phone and the file is not corrupted.
Sent from my LG-P500 using Tapatalk
Click to expand...
Click to collapse
^^^ correct but if this not work then place teamwin flashable recovery in sd card and then flash it then format all in it
Place zip somehow in sdcard use frndz phone or any card reader
Sent from my LG-P500 using xda premium

Xperia s stuck :(

i went and unlocked my bootloader and installed CWM recovery but now my phone wont mount i get usb mtp error and now i dont know as to what do CWM says unable to open lunfile etc , please can anyone help me get my phone bk please.
Thanks
Dan
dpcragg said:
i went and unlocked my bootloader and installed CWM recovery but now my phone wont mount i get usb mtp error and now i dont know as to what do CWM says unable to open lunfile etc , please can anyone help me get my phone bk please.
Thanks
Dan
Click to expand...
Click to collapse
can u instill zip from sd if you can download fxp for ur device
help
i can go into that on the phone recovery but the phone only boots cwm recovery
dpcragg said:
i can go into that on the phone recovery but the phone only boots cwm recovery
Click to expand...
Click to collapse
if you can boot to cwm then download fxp for your device
transfer to sd card
install zip from sd
and your phone should boot
help
doesnt have removable sd card all internal
So you can't even mount that internal memory for use with computer?
Sent from my WT19i using xda app-developers app
help
nope however i flashed a kernel.sin through fastboot and is now on but if i go bk into recovery mode cwm will it say the same . i only wanted install the avid sound mod lol
You can now try to put the .zip file of your sound mod to internal memory which, as I understood is one large built-in memory card and try to install it from CWM, but remember to always make full backup in CWM recovery before flashing, as sometimes even a little mod can make phone stuck in boot loop etc.
Sent from my WT19i using xda app-developers app
help
CWM recovery says unable to open lunfile etc tho whatever that is as it didnt mount it hopefully ill try now n see if it mounts
Ok, later say the condition of phone - can you boot in system or CWM recovery or not and btw where do you get that error about mounting - in CWM recovery?
Sent from my WT19i using xda app-developers app
help
so far phone boots into system but if i go into cwm recovery it might not i dunno and yes says that error in cwm recovery etc hope it mounts lol
I think You need other kernel, but be careful and look for kernel that works with your phone model and Rom (which is stock Rom, as I understand) as modified kernels should always have CWM recovery which you need for that sound mod to be flashed from phone.
Sent from my WT19i using xda app-developers app

[Q] xperia u : no rom installed with no backup

Hello
I am currently in a big problem. I just accidently wiped all my data. I didn't backup and cwm is not installing aokp rom. The boot screen only stucks to "Free Xperia Project" Logo and does nothing else.
I tried flashing ics firmwire again but it failed. I also tried pushing cyanogenmod rom to my sd card my it keep on giving no device error.
I dont know what to do now. Simply cant even explain it properly. Can someone help me please.
Did you try repair with SUS or PCC?
If you can still enter CWM or you even get a boot logo then your ok, it will be an easy fix.
Sent from my ST25i using xda app-developers app
PCC and SUS are not able to detect XPU because XPU is not able to connect to pc.
Yes I can enter CWM and see boot logo.
MrVerifit said:
PCC and SUS are not able to detect XPU because XPU is not able to connect to pc.
Yes I can enter CWM and see boot logo.
Click to expand...
Click to collapse
Enter cwm, connect the phone to the pc, open something like "mounts and storage">"mount usb storage" in recovery.
Copy the rom that you want to flash from pc on your internal memory, unmount usb storage and flash the rom :fingers-crossed:
Can you connect in flashmode?If so,flash stock ftf file.
elia222 said:
Enter cwm, connect the phone to the pc, open something like "mounts and storage">"mount usb storage" in recovery.
Copy the rom that you want to flash from pc on your internal memory, unmount usb storage and flash the rom :fingers-crossed:
Click to expand...
Click to collapse
I tried this but still unable to connect XPU to pc.
Thanks anyway
And will try flashing stock ftf file using flashtool as soon as i get the stock ftf file. By the way where can i get one.
MrVerifit said:
I tried this but still unable to connect XPU to pc.
Thanks anyway
And will try flashing stock ftf file using flashtool as soon as i get the stock ftf file. By the way where can i get one.
Click to expand...
Click to collapse
http://forum.xda-developers.com/forumdisplay.php?f=1728
neectron said:
http://forum.xda-developers.com/forumdisplay.php?f=1728
Click to expand...
Click to collapse
Wow
I tried flashing GB ftf and it worked. :victory:
Thanks neectron

A rom can't be flashed by a noob

Right, I have a rooted Xperia Sola and I want to flash the eXperience ROM, and I don't know how to do that.
The problem is that I can't understand most of the instructions of flashing the ROM, so you guys can help me, please?
Ok, here it goes...
Flash any Stock .54 FTF (use flashtool). Ok, got it...
Let it boot properly. Ok, got it...
Download eXperience.zip and transfer to internal memory. Right.
Flash boot.img from Munjenis v5 CWM kernel.zip (use flashtool). Ok, I can do that...
Now boot to CWM recovery. CWM? WTF?
Flash the eXperience.zip via CWM. What?
You will be entered in AROMA Uh?
Now follow the instructions(Select your device carefully.) select the apps you want to install and remove. Ok.
Again boot to CWM recovery. DAMN CWM...
Do a wipe data/factory reset. What the hell is that?
Wipe Dalvik Cache I don't know...
Turn the phone on and wait for POWER OFF button, when it appears hit the button.Ok.
Click to expand...
Click to collapse
It's just that, I can't understand these words, please, i'll thank if you help me. (I know how to use that button)
Thank in advance.
Man you need get in CWM....!!! Than instal that rom
Sent From C6603 Using xda premium
Um...
Encang_Rojali said:
Man you need get in CWM....!!! Than instal that rom
Sent From C6603 Using xda premium
Click to expand...
Click to collapse
Thank you, but, what is CWM?
manudo said:
Thank you, but, what is CWM?
Click to expand...
Click to collapse
Mannn zzzzzz try read this http://forum.xda-developers.com/showthread.php?t=2273748
Sent From C6603 Using xda premium
CWM stands for Clockwork Mod recovery. You need a recovery installed to install any roms or mods....
CWM is a recovery where you could perform several operations like accessing the system files, system partitions etc, for us and as of now it is needed to install custom ROMs.
So as the first step says, you need to flash .54 version of ICS (ftf file) by flashmode (volume down key and plug in USB at the same time, led will light up green) you need to install flashtools (flashing is done by flash tools) in your pc first
Then there is kernel, that is basically the bridge or interface between the phones hardware and ROM, kernel decides the hardware limits and accessibility to the ROM,
In order to replace stock sony kernels you need an unlocked boot loader (boot loader is locked default by Sony) there are few steps to unlock the boot loader, once you do that you can flash custom kernels (kernel files are like "boot.img" .elf files etc)
To flash them you need to enter fast boot mode ( volume up key and plug in USB, led will light up blue) or there will be flash able zip version which can be flashed by CWM (again recovery, which can be accessed by repeated pressing of volume down at the booting Sony logo), custom kernels have pre installed CWM.
After kernal that is boot.img switch on, on Sony logo press repeatedly volume down lets you enter CWM, you have to perform some wipes, that is data (factory reset, cache, and dalvik cache) after that choose "install zip from SD card" install the ROM.zip file, (assuming you have already put the ROM.zip in your sdcard, ROM = name of the ROM here it is experiencev2) you are done after the installation is complete, reboot and you enter AROMA, its an installer again, follow on screen instructions.
And you have that ROM.
Sent from my Xperia U using xda app-developers app
If you don't read the Guides listed in the General Section, then u won't be able to do stuffs that you want.
Reading helps a lot rather than asking questions.
What i meant, if u read the guides you will get the answers more quickly.
mrmbk said:
CWM is a recovery where you could perform several operations like accessing the system files, system partitions etc, for us and as of now it is needed to install custom ROMs.
So as the first step says, you need to flash .54 version of ICS (ftf file) by flashmode (volume down key and plug in USB at the same time, led will light up green) you need to install flashtools (flashing is done by flash tools) in your pc first
Then there is kernel, that is basically the bridge or interface between the phones hardware and ROM, kernel decides the hardware limits and accessibility to the ROM,
In order to replace stock sony kernels you need an unlocked boot loader (boot loader is locked default by Sony) there are few steps to unlock the boot loader, once you do that you can flash custom kernels (kernel files are like "boot.img" .elf files etc)
To flash them you need to enter fast boot mode ( volume up key and plug in USB, led will light up blue) or there will be flash able zip version which can be flashed by CWM (again recovery, which can be accessed by repeated pressing of volume down at the booting Sony logo), custom kernels have pre installed CWM.
After kernal that is boot.img switch on, on Sony logo press repeatedly volume down lets you enter CWM, you have to perform some wipes, that is data (factory reset, cache, and dalvik cache) after that choose "install zip from SD card" install the ROM.zip file, (assuming you have already put the ROM.zip in your sdcard, ROM = name of the ROM here it is experiencev2) you are done after the installation is complete, reboot and you enter AROMA, its an installer again, follow on screen instructions.
And you have that ROM.
Sent from my Xperia U using xda app-developers app
Click to expand...
Click to collapse
Really thanks, man. That helped me a lot! I will flash my phone soon. Thank you.
Sent from my MT27i using xda app-developers app
manudo said:
Really thanks, man. That helped me a lot! I will flash my phone soon. Thank you.
Sent from my MT27i using xda app-developers app
Click to expand...
Click to collapse
That's why we have Q&A section, spread what you know
:thumbup: happy flashing
Sent from my Xperia U using xda app-developers app
question
mrmbk said:
That's why we have Q&A section, spread what you know
:thumbup: happy flashing
Sent from my Xperia U using xda app-developers app
Click to expand...
Click to collapse
Do I really need SD Card for flashing a custom ROM?
and gazedCon
Hi,
better to get one do', not expensive and useful loll or buy an xperia P then u don t need an sd card...
When u gonna flash there will be an option select zip from sd card in CWM; or u flash rom with flashtool with the ftf file of your rom, its up to you, or its gonna be actually up to the file you gonna download.
I read a lot before flashing a rom! you better to read some more before doing it, just an advice!
First flash for me a week ago and today im on xperia P
nemesis 5.1 kernel enigma rom 4.4 cwm 6.0.1.2 and bootloadder unlocked be sure i spend hours in front of that screen :laugh:
take it easy
manudo said:
Do I really need SD Card for flashing a custom ROM?
Click to expand...
Click to collapse
Yeah, the ROM.zip file to flash has to be either in the media internal storage or SD card (copy it before flashing the kernel) only then CWM recovery can access the package for installation.
Sent from my Xperia U using xda app-developers app
mrmbk said:
Yeah, the ROM.zip file to flash has to be either in the media internal storage or SD card (copy it before flashing the kernel) only then CWM recovery can access the package for installation.
Sent from my Xperia U using xda app-developers app
Click to expand...
Click to collapse
I've asked in the ROM's thread and they say that an external SD card is not needed. I don't know what to do now...
Sent from my MT27i using xda app-developers app
manudo said:
Right, I have a rooted Xperia Sola and I want to flash the eXperience ROM, and I don't know how to do that.
The problem is that I can't understand most of the instructions of flashing the ROM, so you guys can help me, please?
Ok, here it goes...
It's just that, I can't understand these words, please, i'll thank if you help me. (I know how to use that button)
Thank in advance.
Click to expand...
Click to collapse
Once again mate, what you want is to flash a custom ROM.
download the ROM, it may consist of the kernel file “boot.img” inside the ROM.zip or separate links would be there for the kernel.
[These custom kernels have CWM preinstalled]
so here it goes
1. could be as you said, flash .54 ICS firmware, hope you know that.
2. Switch on the device, let it boot. Copy the ROM.zip file in the SD card or internal storage.
3. Switch off, enter fastboot mode (assuming you have an unlocked bootloader)
3. Download the above said kernel, if its in boot.img, use flashtools in fastboot mode (fastboot mode>select kernel to flash) to flash the kernel (so after kernel flashing you have the kernel installed with CWM in it)
4. Switch on, on seeing sony logo, repeatedly press the volume down key, you enter CWM.
5. Perform wipes (for clearing or deleting user data /cache to make it a clean install)
-wipe data
-wipe cache
-advanced>wipe dalvikcache
6. Now on the main menu find “install zip file” access the location where you have stored the ROM.zip file, whether in internal storage or external SD card.
7. Click install, done !
8. Again wipe data and wipe cache
9. Reboot, let it boot
you have new ROM.
try reading more tutorials in the general section if this didnt help you.
mrmbk said:
try reading more tutorials in the general section if this didnt help you.
Click to expand...
Click to collapse
Lmao you re right!
Manudo you really need to read some more tutorials before flashing if you don t understand what you doing that gonna become dangerous for your mobile...
and actually hope you know that the bootloader once unlocked void your warranty... don t mess it up with flashes, read a week more then flash a custom rom!
Anyways we are here if something goes wrong :laugh:
Sorry for being a noob, but I understand, finally...
The boot.ini file is always at the root directory of the zip file, right?
Sent from my MT27i using xda app-developers app
Nope that boot.img or kernel.elf or kernel.sin has to be at the root of the sd card that means in no any folders u drag it n drop it directly on the name of
the drive in windows. Then u flash but before doing it u have to put the rom.zip at the sd card root too...
Got it?
depuis mon Xperia P avec Tapatalk 2
Alx31TLse said:
Nope that boot.img or kernel.elf or kernel.sin has to be at the root of the sd card that means in no any folders u drag it n drop it directly on the name of
the drive in windows. Then u flash but before doing it u have to put the rom.zip at the sd card root too...
Got it?
depuis mon Xperia P avec Tapatalk 2
Click to expand...
Click to collapse
Yeah, but... The CWM part, I read that it's necessary to have the unlocked bootloader to flash the CWM Kernel, I tried but flashtool gave me an error that says that I don't have root access. At the beginning the log says "Root Access Allowed", I can't understand...
Thank you in advance.
Sent from my MT27i using xda app-developers app
Ok
Kernel and cwm its two different things clockwork recovery mode its like a small soft that gonna be useful for you to set up the kernel. The first thing to load on the mobile its the bootloader then kernel then firmware (rom)
A rom that u gonna flash HAS to be compatible with kernel u want to flash
If you want to get your rom rooted i don t think (unless theres a way to do it on ure phone) you can do it with flashtool most of the time you have to downgrade to an older version of your rom cuz root is voluntary blocked by sony to deny u access to it but developpers found weakness in systems but it takes time and sony by updating systems find those weaknesses and fix it.
Then i m not sure u have to get unlocked bootloader to enter flash mode but once again to do it void warranty and to unlock it permit u to flash a custom kernel
So at the end....what u wanted to do? Flash a custom rom?
then if its yes
FIRST OF ALL You unlock bootloader,then put a custom kernel,then a custom rom and for this u look below mrmbk told u how to do it
sent with my perfexperia P using tapatalktak
Right, I have to unlock it...
But, I have that fear to brick the phone, you know?
Sent from my MT27i using xda app-developers app

Help with CWM Recovery on my Sony Ericsson Xperia Mini Pro

Hi there
Well my phone is rooted and unlocked bootloader, im new to this so i want to install the new kit kat rom on it but i dont know if i installed clockwordmod well cause when i access it it says that it doesnt have recovery for my mobile phone , can someone post me a link to install a correct rom manager pro and recovery and explain how i enter the recovery mod later cause i tried volume up , volume down everything and it continued to the xperia logo dont know why maybe i dont have the recovery well installed,
Thanks guys im a newbie in this so be patient please
helderhalen said:
Hi there
Well my phone is rooted and unlocked bootloader, im new to this so i want to install the new kit kat rom on it but i dont know if i installed clockwordmod well cause when i access it it says that it doesnt have recovery for my mobile phone , can someone post me a link to install a correct rom manager pro and recovery and explain how i enter the recovery mod later cause i tried volume up , volume down everything and it continued to the xperia logo dont know why maybe i dont have the recovery well installed,
Thanks guys im a newbie in this so be patient please
Click to expand...
Click to collapse
Cwm isn't enough... You need custom kernel...and custom kernels come with cwm... So unlock boatloader... Flash kernel... Then Rom will work..
Sent from my Xperia Neo V using Tapatalk 2
Attitude.SSJ said:
Cwm isn't enough... You need custom kernel...and custom kernels come with cwm... So unlock boatloader... Flash kernel... Then Rom will work..
Sent from my Xperia Neo V using Tapatalk 2
Click to expand...
Click to collapse
Im trying to install this rom http://forum.xda-developers.com/showthread.php?t=2545367 , how do i get the custom kernel?
Thanks
the kernel is in the rom zip file, named boot.img
flash it via fastboot mode.
an0nym0us_ said:
the kernel is in the rom zip file, named boot.img
flash it via fastboot mode.
Click to expand...
Click to collapse
Ok but then i cant access the recovery on my phone to install the rom , i tried the volume up, down etc and nothing works... i think the cwm isnt working properly....
if u already flashed to boot.img, just repeatedly press volume down button when phone booting, on kernel logo while led lights up.
an0nym0us_ said:
if u already flashed to boot.img, just repeatedly press volume down button when phone booting, on kernel logo while led lights up.
Click to expand...
Click to collapse
Ok the only way i can get to boot is installing x parts and then i press the sony logo and the boot appears, but it tells me that i cant wipe system cause the CWM will delete too , with the normal rom manager pro i downloaded the last version on aptoide i cant get any recovery and i cant get to bootloader , i need help, post me a link to download a version of CWM that works with SK17i.
Thanks
did u even flash the boot.img from rom zip?
an0nym0us_ said:
did u even flash the boot.img from rom zip?
Click to expand...
Click to collapse
If i cant access the bootloader how the hell can i install the rom? i didnt flash the rom yet im trying to figure out yet how to access the CWM recovery thats what im having trouble right now
then stop trying to figure out thing u cant achieve.
aosp base rom such as cm11 u want to install require flashing custom kernel, the boot.img provided in the rom zip, which in the kernel itself contains cwm recovery.
if u manage to flash it then u will get cwm that came with the kernel.
an0nym0us_ said:
then stop trying to figure out thing u cant achieve.
aosp base rom such as cm11 u want to install require flashing custom kernel, the boot.img provided in the rom zip, which in the kernel itself contains cwm recovery.
if u manage to flash it then u will get cwm that came with the kernel.
Click to expand...
Click to collapse
oh sorry i wasnt understanding that, i thought it didnt have any recovery, ok but now i installed a recovery from some place maybe i have to uninstall it, so im using flashtool , i put my phone in fastboot mode, then i choose select system to flash? Can You explain the steps using flashtool? im new to this tool too. sorry im really new to this roms thing yet..
1- turn off phone
2- hold volume up button and while still holding the volum up, connect usb to phone and pc. led on phone will light ups blue indicating fastboot mode.
3- open flashtool, click on flash button, select fastboot mode, click ok, click select kernel to flash, on dropdown on lower left change to *.img, browse the boot.img, click ok.
4- flashtool main window will give output log of flashing the kernel.
5- remove usb
6- turn on phone
7- while kernel logo appear and led lights up, press volume down repeatedly.
8- phone will now boot into cwm
9- do wipe data/factory reset
10- flash rom
11- flash gapps
12- profit
anyway, why did u want to flash the buggy cm11?
try custom rom based on stock first, or miui, or cm9 or cm10. those roms are stable enough for everyday use.
an0nym0us_ said:
1- turn off phone
2- hold volume up button and while still holding the volum up, connect usb to phone and pc. led on phone will light ups blue indicating fastboot mode.
3- open flashtool, click on flash button, select fastboot mode, click ok, click select kernel to flash, on dropdown on lower left change to *.img, browse the boot.img, click ok.
4- flashtool main window will give output log of flashing the kernel.
5- remove usb
6- turn on phone
7- while kernel logo appear and led lights up, press volume down repeatedly.
8- phone will now boot into cwm
9- do wipe data/factory reset
10- flash rom
11- flash gapps
12- profit
Click to expand...
Click to collapse
I have to send the folder cm-11.0-20131225-NIGHTLY-LegacyXperia-mango.zip and the gapps folder to sd card before i flash kernel right?
yes, both the rom zip and gapps zip need to be in sdcard.
and if i'm not mistaken, cm11 need to repartition system partition due to not enough space in it for the big rom.
probably need to manually format system too before flash, i'm not really sure.
ask in the support thread instead
http://forum.xda-developers.com/showthread.php?t=2543426
an0nym0us_ said:
yes, both the rom zip and gapps zip need to be in sdcard.
and if i'm not mistaken, cm11 need to repartition system partition due to not enough space in it for the big rom.
probably need to manually format system too before flash, i'm not really sure.
ask in the support thread instead
http://forum.xda-developers.com/showthread.php?t=2543426
Click to expand...
Click to collapse
It Just says This:
WARNING: This ROM uses a modified internal memory layout.
Our /system partition is originally 400MB but this space is not enough for a fluid kitkat experience and a full installation with proper google apps.
Our /cache partition is also too small to fit art-cache when we enable the ART runtime. We originally had 100MB /cache but art-cache needs ~150mb of free space.
I have repartitioned the internal memory layout, giving:
450mb in /system
469,5mb in /data
8mb in /cache
Steps required for correct installation (order is important):
1: Flash boot.img in fastboot & reboot into recovery
1.1 (optional): If the device is not booting, reboot to bootloader again and run:
fastboot erase system
fastboot erase userdata
2: Enter recovery, go to mounts and storage
3: Format /system, then /data and then /cache (Important step!)
4: Flash update zip
5: Flash gapps (recommended package is the one provided in the link below)
Steps 1.1, 2 & 3 are not needed when you install new cm11 nightlies on top of older cm11 builds in the future
If you want to return to a ROM that doesn't use the new partition layout, you need to follow the above steps again (only replace boot.img & update zip with the ones you want to use).

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