Model: SHT-AL09, shipped with C636 (Asia) firmware. It may have originally been C00. Bootloop became a no-boot (it doesn't get past 'this device is unlocked' and load animation) after I flashed some system.img files in an attempt to fix.
I am willing to start from scratch. Fastboot works and Multi-tool works. Bootloader remains unlocked. Stock recovery is currently of no help.
I would greatly appreciate assistance. In the mean time, I'd love to know if it is possible to turn the screen off without letting the battery die out.
What did I initially do? I wanted to test some small changes to my build.prop (which I had already successfully tweaked). They were conservative changes that I felt for sure would not give me a bootloop. Worst case, I had a good build.prop file I could push via adb.
Turns out - a.) bootloop, b.) if USB debugging is not enabled adb is useless.
Early on, the device auto-booted into recovery, and I don't know if I pressed the power button or what, but some recovery process began. I didn't want to risk a wipe at that time, so I booted into download mode while process was at maybe 8%. I don't know if anything was wiped.
I was successfully able to flash system.img from c00/c434 firmwares....as noted that didn't get me anywhere....
Related
Here's my situation, maybe someone will find it interesting or know what's going on. I was running the EOS Jelly Bean (EOS-tf201-20120728-31.zip). Everything was running pretty well for a few days, then yesterday the device simply powered off. When I rebooted it got to the splash screen then shut off before it could get any farther. I figured it was a power issue, so I plugged it in and charged it for a while but get the same response. Around this point I started to get suspicious and tried to boot into recovery. It got to "Booting Recovery Kernel Image" then powers off the same way.
So then I proceed to go into fastboot and fastboot works great no power offs. Through that I am able to flash openrecovery-twrp-2.2.1-tf201.blob and the virtuous packaged boot as per this thread http://forum.xda-developers.com/showthread.php?t=1773280 as well as factory reset. I also tried a few other boot/recovery combinations and was able to make it into recovery. In twrp recovery I was able to install the latest Virtuous rom which got me back to stock and I thought good case closed. I even made it all the way into the OS and was able to install apps, wifi worked great, run the apps etc. Eventually the screen went blank though and I was stuck back in the same shutdown on boot scenario as described above. Now I'm able to fairly consistently flash openrecovery-twrp-2.2.1-tf201.blob, reboot, get into teamwin recovery, but now even that appears to be randomly powering off.
So now I'm guessing that it may just be bricked and is probably a hardware issue since the reboots appear so random, the unit was refurbished. At the same time I'm still holding out some hope that it's simply some boot code somewhere that was corrupted and I can flash something and get things back to normal again since I can still access fastboot and occasionally ADB and recovery. I've flashed from fastboot system/recovery/boot, any other thoughts or potential combinations I could try? Also anything I can do with those tools to debug it further and get more data on what may be the root cause?
I'm not an expert in Android, nor am I an expert with computers, just an average joe in the Android world. Since the time I got myself into this community I never stopped learning something small. I was able to root my phone, install custom firmwares, unroot my device, do a NANDroid back up. All of this done with the help I got from an online source. Now, I'm looking forward to do further tweaks in my device's system. It might sound risky, but I'm enticed by how far an android device can be further improved. But before I do any of this, I'd like to know the appropriate steps to do when something goes wrong like what if device ends up on boot loop.
Questions:
1) What is boot loop?
2) What causes boot loop?
3) Is it the same with a bricked phone?
4) Can the phone be recovered from it (boot loop / brick)?
5) What should be done when a phone is on boot loop?
I humbly ask everone to share a bit of your knowledge about this.
Thank you.
1 - Is kinda of obvious. Bootloop is when your device is stuck at some of bootscreens (model screen, Samsung logo screen) and it doesn't boot properly. Even if you remove the battery and insert it again to turn it on, it doesn't turn on.
2 - There are various reasons: incompatible kernel, incompatible rom, edits on build.prop, rom poorly flashed. And, for our device, if you try to reboot into recovery directly and it has CWM installed, it may enter on recovery bootloop.
3 - I''d say it is a "soft bricked phone". If you has access to recovery or download mode, congrats, you can undo the mess. But if you can't, you got a hard brick. So, it will need repairs.
4 - As I said before, if you has access to recovery or download mode, it is possible to recover it.
5 - It depends. First I would undo my last actions. If I don't have success, I would reflash stock rom, it's almost guaranteed.
So, it happened to my phone when I attempted to do a "Recovery Back Up" using "[ROOT] Rashr" app. I had a Recovery Boot Loop, which boots only into Recovery Mode. But it's fixed now. Here's the thread: http://forum.xda-developers.com/grand-quattro/help/s-o-s-device-boots-cwm-t2981980
This is a reference for those who have the same problem.
I was on my phone when suddenly it just booted off for no reason, weird right? So now it just stays on the "LG" boot up screen and now do anything. I've tried everything and done everything right (as far as I know) before I get into that let me tell you what my device can do as of now:
Devices DOES have fastboot oem unlock done
Phone was rooted as well and working perfectly (or so I thought until this happened)
ADB doesn't seem to work, but fastboot when connected to the computer does.
Ex: ADB devices (blank)
but fastboot devices (shows phone connected)
I've tried rebooting into recovery (Power + down) doesn't do anything, however, {Power + down} then finger off power then {Power + down} again takes me to "factory reset" option, if done so the phone just hangs and removing battery on way to take it back to fastboot on pc, or bootloop again.
I've done the following steps using [LG-H901] Stock .img Files (Boot, System, and Recovery)
Code:
fastboot flash system system.img
then
fastboot flash boot boot.img
and finally
fastboot flash recovery recovery.img
I've tried booting the phone and still gets me stuck on bootloop, and doing the same {Power + down} gets to the same "factory reset" option only then freezes my phone if I agree to do so.
Is there something I've done wrong or incorrect? I will provide as much info as requested.
Thanks guys!
Update: Phone booted up to lockscreen after finishing "Android is starting..." procedures, then kept bootlooping and it is now doing "Android is starting.." procedures again. I'll keep it updated if it keeps doing so or anything of the sort.
Did you reply YES when trying to enter recovery? It will ask 2 times and bith times answer YES ... And if you DO have TWRP installed it will boot into twrp recovery.
Double0EK said:
Did you reply YES when trying to enter recovery? It will ask 2 times and bith times answer YES ... And if you DO have TWRP installed it will boot into twrp recovery.
Click to expand...
Click to collapse
This is the weirdest thing, phone worked for a bit then shuts off and does the same thing. all files and everyhing was in tact. ANy main reason behind this? I am desperate not to delete everything because i have important photos on there that were still there when it re-started again right now.
So to recap: At the moment doing the {factory reset} got me as far as using phone for like 2 minutes before ****ting out and sending me on a bootloop yet again.
Important Questions:
On all my other devices I am able to connect via usb and read devices, but on this phone I get the message when connecting to my computer "LGE Android MTP Device: Failed" whats this about?
Is there any way to save internal photo album images other than getting this to boot up and pray it stays on long enough to transfer data?
UPDATE 2: Phone has booted up and not froze (yet)? Testing to see if it will keep working so far so good. Unfortunately all my **** was deleted which bummed me out, would have honestly prefered to lose a $600 phone than all the family, friend, ext photos I had on my phone I made the huge mistake of saving to internal memory and never backing up. Smh.
Update 3: Phone is back at it again with the bootloop. I have no idea what is wrong, I've repeated the steps twice and phone doesn't seem to let up. It's fine until I hit that restart or shutdown button then it goes into bootloop heaven. I'm guessing this phone is done for? On an unrelated note it did fall on me, but worked fine afterwards, it was just sudden when it started doing this. Unless anyone has more suggestions I'd be glad to hear them. As of right now, this phone is toast.
You tube how to bake phones in the oven.
It could fix some potentially loose solders..or since everything was already wiped you should get a warranty replacement.. Should still be under factory warranty.
Double0EK said:
You tube how to bake phones in the oven.
It could fix some potentially loose solders..or since everything was already wiped you should get a warranty replacement.. Should still be under factory warranty.
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Click to collapse
I am thinking the warranty route. Is there anything specific I should do before doing so? I hear having "fastboot oem unlock" {Bootloader Unlocked} voids the warranty. Is this true that you might know of? Either way thanks I appreciate the information.
Sorry so late..
But you can try to fastboot oem lock it.
Bootloop,no way out: MT8735, 8", Android 5.1 (Archos 80b Helium), need general advice
Hello,
While trying to root my tablet (MT8735, 8", Android 5.1 (Archos 80b Helium)) I messed up, and trying to fix it made it probably worse. The device is stuck in a bootloop, but I can still get into the bootloader (I guess that's the right term) by powering up with Volume+ pressed after force power down (10s power button). I have the alternatives "Recovery Mode", "Normal Boot" - which result in a bootloop again if chosen - and "Fastboot Mode". Fastboot works, and I can connect the device with fastboot.
I'm afraid there's nothing else functional left on the tablet.
Unfortunately there is no stock rom and recovery available. All I have is an "update.zip" which contains a "boot.img", but no "recovery.img". So I tried to port a recovery image for a similar device (or rather deviceS so far) by replacing the kernel and some binaries from the boot.img.
Didn't help, still boot loop. Since I have bricked the device anyway, I decided to take the opportunity to learn more about these android devices (which in the end might help me getting the tablet running again), and here are my questions:
- Is the device able to boot into recovery mode if the recovery.img is ok, but there is nothing at all or nothing working in the "normal boot" section?
- Is there any way in the current situation to find out what is going wrong during the boot process? I can't connect with adb, so is there any way to get some logfiles or so with fastboot?
- As I understand the boot process, the bootloader initializes the memory and loads a kernel, either from the boot section or the recovery section. Am I right to assume that this part is still working on my device? Since I am able to get into the menu where I can chose between normal or recovery mode and fastboot, I don't think that the bootloader itself is broken.
- Assuming that this is right, is it possible to flash a minimal kernel and system into the recovery section, for example? Which does nothing else than show a message and then sits there and waits for power off? What I want to find out this way is whether the basic functionality (bootloader -> kernel -> initialize) is still there.
- If such a thing is possible, are there any suggestions to where to find such a minimal system? As said, I have a kernel for my device, can I build something around it to just give a sign of life?
Thank you for any hints and tips. Though it is annoying to have a bricked device, it is also exciting to be able to learn something new, if possible
Hello,
ummm, no offence meant, please, but isn't this here supposed to be a developers' forum? But still there is noone who can give me any advice about how to find the information I need and requested?
First of all I would need a minimal system - or a way to create one - which can be booted into as (fake) recovery, and which just gives any sign of life, like some message on the screen or an output through the interface, or even a text-line in some file, which I then could extract through fastboot. Or if not possible, I might find on the SD-Card, which I then could read on my PC.
Thanks and kind regards
Hello. I have tried to install a custom recovery (TWRP) on my Samsung Galaxy Tab A 8.0" (SM-T290) today, however, it has not exactly gone to plan. I will run over exactly what I did, and what troubleshooting steps I have taken so far.
I downloaded this version of ODIN: https://forum.xda-developers.com/t/patched-odin-3-13-1.3762572/
I unlocked the bootloader through the bootloader menu and enabled USB debugging after the tablet had turned on.
I downloaded and used the latest .md5.tar TWRP file from here: https://forum.xda-developers.com/t/...-2-for-2019-galaxy-tab-a-8-0-sm-t290.4185235/
ODIN Successfully flashed TWRP and the device rebooted. I attempted to get straight into the recovery by holding volume up, however, the screen remained black.
The tablet now cannot boot into recovery, download mode, etc, and only the backlight of the screen turns on. The tablet does eventually "boot up" and give the little vibration, at which point my computer recognises it, but I cannot see any files on the tablet. I can also see the tablet with ADB using the command "adb devices", however it tells me the tablet is "unauthorized", meaning I cannot use any ADB commands to attempt to reboot into recovery, download mode, etc.
I have tried disconnecting the battery and just powering on with the cable to no avail. I am assuming the device is fully bricked at this point, however, I would be appreciative if any possible solutions could be suggested, and if where I went wrong can be pointed out so I do not make the same mistake in the future.
Thanks in advance.
It's always risky to apply mods.
To get rid off of all mods you applied re-flash tablet's Stock ROM.
If this doesn't work for you then take it to authorized service center and let them try to fix it.
jwoegerbauer said:
take it to authorized service center and let them try to fix it.
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Click to collapse
They never fix anything. The only thing they do is charge you an absurd price and replace the motherboard or the entire tablet.
I'm on the same boat. Tablet can't get into download mode, just shows "This device has unauthorized software on it and is locked". Tried all possible button combinations to no avail.
SmiffyJ said:
Hello. I have tried to install a custom recovery (TWRP) on my Samsung Galaxy Tab A 8.0" (SM-T290) today, however, it has not exactly gone to plan. I will run over exactly what I did, and what troubleshooting steps I have taken so far.
I downloaded this version of ODIN: https://forum.xda-developers.com/t/patched-odin-3-13-1.3762572/
I unlocked the bootloader through the bootloader menu and enabled USB debugging after the tablet had turned on.
I downloaded and used the latest .md5.tar TWRP file from here: https://forum.xda-developers.com/t/...-2-for-2019-galaxy-tab-a-8-0-sm-t290.4185235/
ODIN Successfully flashed TWRP and the device rebooted. I attempted to get straight into the recovery by holding volume up, however, the screen remained black.
The tablet now cannot boot into recovery, download mode, etc, and only the backlight of the screen turns on. The tablet does eventually "boot up" and give the little vibration, at which point my computer recognises it, but I cannot see any files on the tablet. I can also see the tablet with ADB using the command "adb devices", however it tells me the tablet is "unauthorized", meaning I cannot use any ADB commands to attempt to reboot into recovery, download mode, etc.
I have tried disconnecting the battery and just powering on with the cable to no avail. I am assuming the device is fully bricked at this point, however, I would be appreciative if any possible solutions could be suggested, and if where I went wrong can be pointed out so I do not make the same mistake in the future.
Thanks in advance.
Click to expand...
Click to collapse
Hi,
I have the exact same problem, did you manage to recover the tab?
Thanks heaps