Develop Bugs

Phone boots into firmware update

I recently updated my lg G3 ( Google patch update named Aug-18-2015 etc) and it started to malfunction with resets, crashing and eventually got it stuck in boot loop. Then it booted into a green screen that said "demigod crash handler/tz crash" thrice. Instead of a hard reset I decided to using the lg mobile support tool to fix it. During the upgrade recovery my phone went into download mode/firmware update. I could see the progress bar moving and then get stuck and my mobile would switch off. Took out the battery, disconnected and reconnected the phone and tried the process all over again but in vain. I repeated this at least 8 times and eventually gave up. Now my phone is basically useless and only boots into firmware update. Hard reset doesn't work either. Can somebody please help me fix this?
Android version : 5.0
Kernel: 3.4.0
Firmware : v20t-ame-xx

Did you try to unbrick/unroot (there so much video about it) it should fix it

jonnyszt said:
Did you try to unbrick/unroot (there so much video about it) it should fix it
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I have tried everything available online but nothing works. Im so frustrated atm. :/

Could you enter recovery. Connect your phone into your computer in firewall update and after go on adb and fastboot commends and type adb reboot-recovery

Stuck in Boot loop after weeks of normal usage

Hi.
I have a problem with my D855. My phone is rooted and runs the fulmics ROM. Everything was working fine, , on Fulmics 5.3, except than one day, I was using my phone normally and then it crashed. I saw the phone rebooting, but for some reason it got stuck. The phone tried to boot unsuccessfully until the "firmware update" went through, after what it reboots again (unsuccessfully) and so on.
At that time, I was able to access twrp, do some backup, and flash properly with a downgraded version of fulmics (from 5.3 to 4.1).
It was able to boot again and use my phone like before. Yet, after one month of usage, the same problem happened on version 4.1. The phone crashed and now cannot boot.
Any idea of where it is coming from? Should I go back to stock? Should I contact customer service?

What did you do before the phone crashes ?
I think you probably should flash the stock ROM and wait for an other crash... or not.

Jb-kun said:
What did you do before the phone crashes ?
I think you probably should flash the stock ROM and wait for an other crash... or not.
Click to expand...
Click to collapse
I haven't done anything special. I think that the first time I was playing on candy crush. The second time I was just looking at pictures in my gallery.
I was using the ROM without any tweaks or extra modules such as Xposed. Just regular use.
Update on my situation: I switched back to stock ROM and it seems to work OK for now (it has been 4 days). So I will wait and see if new problems happen. By the way, it was extremely difficult for me to get back to Stock directly from fulmics ROM. I tried several methods that I have found on xda based on LGUP or LG Flash tool without success. For some reason I was not able to connect the phone to my PC in download mode.
The only way that I found was to use a nandroid backup that I did just after rooting the phone and that was based on stock ROM.

shewshain said:
I haven't done anything special. I think that the first time I was playing on candy crush. The second time I was just looking at pictures in my gallery.
I was using the ROM without any tweaks or extra modules such as Xposed. Just regular use.
Update on my situation: I switched back to stock ROM and it seems to work OK for now (it has been 4 days). So I will wait and see if new problems happen. By the way, it was extremely difficult for me to get back to Stock directly from fulmics ROM. I tried several methods that I have found on xda based on LGUP or LG Flash tool without success. For some reason I was not able to connect the phone to my PC in download mode.
The only way that I found was to use a nandroid backup that I did just after rooting the phone and that was based on stock ROM.
Click to expand...
Click to collapse
You can also use the Stock rom flashable from twrp. So you can wipe the system partition and get a "better situation" than a nandroid backup that should be with an old version.
Or use this that has also root and other improvements.

shewshain said:
Hi.
I have a problem with my D855. My phone is rooted and runs the fulmics ROM. Everything was working fine, , on Fulmics 5.3, except than one day, I was using my phone normally and then it crashed. I saw the phone rebooting, but for some reason it got stuck. The phone tried to boot unsuccessfully until the "firmware update" went through, after what it reboots again (unsuccessfully) and so on.
At that time, I was able to access twrp, do some backup, and flash properly with a downgraded version of fulmics (from 5.3 to 4.1).
It was able to boot again and use my phone like before. Yet, after one month of usage, the same problem happened on version 4.1. The phone crashed and now cannot boot.
Any idea of where it is coming from? Should I go back to stock? Should I contact customer service?
Click to expand...
Click to collapse
Same problem here. Normal usage suddenly started to reboot and now it's stuck in boot loop

Coming from Fulmics too - stopped working one fine day.
Now, continues to boot-loop at the initial LG screen. Trying to get into the recovery shows me the the 'Factory Reset' screen, but beyond that leads to boot-loops again. Even the Download mode loops!
I'm at my wits end without a solution in sight.

Blysterk said:
You can also use the Stock rom flashable from twrp. So you can wipe the system partition and get a "better situation" than a nandroid backup that should be with an old version.
Or use this that has also root and other improvements.
Click to expand...
Click to collapse
Thank you for this advice. I was able to update my stock ROM after the Nandroid backup through LGUP, but your method would have been faster.
But anyway, I am waiting to see if I am stuck with bootloops again, using non-root stock version, so I can send it to customer service if this happen again.
AhmadAlmousa said:
Same problem here. Normal usage suddenly started to reboot and now it's stuck in boot loop
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abourdeau said:
I have the exact same problem, I even bought a second battery with no success.
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Click to collapse
Are you using Fulmics ROM as well? Can you have access to TWRP? I was able to connect to a PC in the recovery mode and to transfer files before flashing, in case you need some basic backup...

prakhargr8 said:
Coming from Fulmics too - stopped working one fine day.
Now, continues to boot-loop at the initial LG screen. Trying to get into the recovery shows me the the 'Factory Reset' screen, but beyond that leads to boot-loops again. Even the Download mode loops!
I'm at my wits end without a solution in sight.
Click to expand...
Click to collapse
Silly question, but are you sure that you selected "Yes" when the screen asks you about factory reset? you have to press "volume down" and the "power button", since the default answer is no.

shewshain said:
Silly question, but are you sure that you selected "Yes" when the screen asks you about factory reset? you have to press "volume down" and the "power button", since the default answer is no.
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Click to collapse
Yes, of course I was able to access TWRP successfully earlier.
Curiously enough, the phone boot-loops in regular startup, Download mode and trying to get to recovery. However, it doesn't restart itself and fall into a loop, while on the Factory Reset menu. Am I correct in assuming that the battery could not be the root cause of the overall problem? Because if it was, it would likely loop even on this Factory Reset menu as well as far as I understand.
Unfortunately, the phone restarts as soon as it lands in the Download mode so I cannot even restore to stock.
EDIT: Okay, weirdly enough it just booted and reached the homescreen before restarting again. What I did was let it charge to a 100% and tried booting while plugged in. Could it be the battery after all? Though this exact set of steps hasn't been helpful before.

LG G4 H815 Euro - Troubles flashing stock ROM

Hello to all of you,
Thanks in advance for any help you can provide.
I bought second hand a LG G4 H815 with CyanogenMod 14 already installed on it.
Everything was fine until I installed my Ebanking apps, that would not function with an unlocked bootloader. I needed to return to a clean factory safe state...
It was the second time I flashed a rom in my whole life, the first one was a Galaxy S plus years ago.
I followed all the instructions for the KDZ flash in this tutorial but I stumbled upon a "Upgrade stopped due to error" in LG flash tool.
I retried 3 or 4 times but with no luck. I verified that the ROM was correct for my model and it was. European and all...
I tried LGUP but my phone is unknown ( at least it's detected)...
I read some posts and told myself "I probably have messed up something, let's try it again with a fresh thing"... I clicked on the factory reset button and carried on.
There the phone booted on TWRP (That i didn't know existed before this). As I explored the menus with a TWRP google search on the computer, I began to realize that the factory reset was maybe a bad thing to do with a custom rom. I tried to reboot but I always end up booting on TWRP.
I re-tried to flash in download mode, but with always the "Upgrade stopped due to error".
I also tried to flash directly from TWRP a stock rom. Didn't work.
I was beginning to lose it and tried to flash the CM14 version I had before, juste to have a working phone again, but even this didn't work... I'm stuck with a TWRP phone
I need some help there...

FamousCarpet said:
Hello to all of you,
Thanks in advance for any help you can provide.
I bought second hand a LG G4 H815 with CyanogenMod 14 already installed on it.
Everything was fine until I installed my Ebanking apps, that would not function with an unlocked bootloader. I needed to return to a clean factory safe state...
It was the second time I flashed a rom in my whole life, the first one was a Galaxy S plus years ago.
I followed all the instructions for the KDZ flash in this tutorial but I stumbled upon a "Upgrade stopped due to error" in LG flash tool.
I retried 3 or 4 times but with no luck. I verified that the ROM was correct for my model and it was. European and all...
I tried LGUP but my phone is unknown ( at least it's detected)...
I read some posts and told myself "I probably have messed up something, let's try it again with a fresh thing"... I clicked on the factory reset button and carried on.
There the phone booted on TWRP (That i didn't know existed before this). As I explored the menus with a TWRP google search on the computer, I began to realize that the factory reset was maybe a bad thing to do with a custom rom. I tried to reboot but I always end up booting on TWRP.
I re-tried to flash in download mode, but with always the "Upgrade stopped due to error".
I also tried to flash directly from TWRP a stock rom. Didn't work.
I was beginning to lose it and tried to flash the CM14 version I had before, juste to have a working phone again, but even this didn't work... I'm stuck with a TWRP phone
I need some help there...
Click to expand...
Click to collapse
uninstall any drive for g4 from pc and reinstall again and lgup. now reboot phone to download mode when lgup is open first check upgrade opsion and when open kdz check refurbish opsion and start. good luck

Thank you for your answer
Still no luck
Uninstalled drivers
Rebooted PC
Reinstalled the drivers
Still unknown device

The best way to flash stock image is to use official LG Bridge app. Download it, turn off your phone, connect it to PC while holding volume up button - phone will go into download mode. Then there is option for software restore in LG Bridge but i won't tell u where exactly. If it won't work i would try on another PC. If it won't work maybe you would be able to flash stock image trough send_command but i won't help you with it.

FamousCarpet said:
Thank you for your answer
Still no luck
Uninstalled drivers
Rebooted PC
Reinstalled the drivers
Still unknown device
Click to expand...
Click to collapse
open lgup torn off the phone press volume up insert usb cable wait to see download mode on phone release up button and see if everything go fine

Thank you a lot Avantu, the LG Bridge did the trick! I now have a factory rom!

Lg G3 Stuck in Recover Loop After Android Update Error

Okay, So let me start from the beginning so I'm certain I'm being descriptive enough.
The other night my G3's wifi stopped working. When I went to turn it on in settings it would turn itself back off. Which I thought was strange. So, I assumed it was a software issue so I backed up any important items and factory reset my phone last night. That went over fine. Wifi worked again, all was good. Until, it said it needed an Android Software Update. I hit "update" and allowed it to do its thing. About halfway through the update the phone said "error." With an icon of the Android bot with a hazard triangle sticking out from it. I let it be for a bit and nothing happened. So in my impatience I took the battery out and put it back in and tried to restart the phone. This is where the issue occurs. The phone keeps booting to recovery mode. I'm not savvy at all with Android so I don't know if these mean anything but it says "Android System Recovery <3e> LRX21Y" The phone has had zero modifications done to it. I would really appreciate any help or any tutorials that could save the phone until my g6 preorder comes in.
Thanks!
Kyle

Your phone failed the update for some weird reasons and is now stuck. I'm afraid you'll need to restore stock Android using LG Flash tools and KDZ files to your device. It will get your phone working, but you'll lose your data in the process.
You can try mounting the phone from recovery or download mode and see if you can access your data and backup the data. You can also try the recovery option without downloading wnloaing a KDZ first.
You can fins tutorials around the forum, in the general section usually.

HELP PLEASE.Is there a way to flash or root AT&T Note 5,stuck in boot loop mode???

HELP PLEASE.Is there a way to flash or root AT&T Note 5,stuck in boot loop mode???
Hi to all
I'm member on XDA for a long time,but I really am a newbie considering rooting,flashing and messing with the phones.
Yesterday ,my At&t Samsung galaxy NOTE 5 restarted by itself and started doing that constantly.Maybe because the memory was almost full so the firmware didn't have enough space to run correctly ,I don't really know.
So I decided to do a FACTORY RESET in order to refresh the phone.I backed all up (it did restart few time while I did that but I managed to finish it).
After I did the factory reset and wiped the cache,I rebooted the phone and that is when the boot loop started.
Once or three times came back and started the phone up to the first settings (I managed to put in my google username e.t.c. but after a minute maybe it freezes and restarted by itself again)
I tried again another factory reset but the boot loop continues.I tried many time to turn it off,it restarted up to INSTALLING UPDATE......then tried to turn it off completely (Volume down+Power+Home button) and somehow I managed to turn it off.
I thought that I can come here and find the instructions on how to FLASH it with ODIN,but I couldn't find the stock firmware for AT&t Note 5.
Then I remembered (and read on internet) that the bootloader on AT&T phones is locked !!!!!
I searched some threads here for at least how to root it ,but I can't find anything clearly.
So I'm asking you for help: IS THERE ANY SAFE WAY THAT I CAN DO FLASH OR ROOT MY AT&T SAMSUNG NOTE 5 (EXPLAINED STEP BY STEP) IN ORDER TO MAKE MY PHONE WORK AGAIN????
I have never before messed with the phone.It has the original stock firmware Android 7.0 Nougat.
And the phone is bought in USA,but I live in EUROPE and have unlocked it ,by buying some code online, few years ago.It was working fine until yesterday.
Thank you in advance guys I hope that someone might help me.
Juno 106

Guys I found here some older version (few months older) of Android 7 for my Note 5 and I managed to do a flash. The flashing went OK I went through settings and after few minutes the phone freezes again and restarts. And then again the same,it works fine for a few minutes,freezes and restarts (I can here the camera working inside sometimes too)...........CAN ANYONE HELP ME REPAIR MY PHONE ,PLEASE ???

Hi again
I don't know why no one is replying to me???
Today I managed to make the settings and power up the phone,restored the back up....the phone is working,BUT the PROBLEM is that it constantly freezes and reboots by itself.Sometimes it works for few minutes and reboots,sometimes it works for 30min and then it reboots,sometimes longer...
What might be the problem? Is it some hardware problem processor ,memory or maybe bad battery? It is older model and I have noticed with Accu Battery that most likely the battery haslowered it's capacity.It drains faster,sometimes when it comes to 15% it drains very fast...
Can anyone help me diagnose the problem?
Thank you in advance

Try booting into Download Mode & flash a new stock firmware if all else fails, assuming u tried a factory reset first with no satisfaction. Guides are everywhere. I HTH

PiMPSoFT said:
Try booting into Download Mode & flash a new stock firmware if all else fails, assuming u tried a factory reset first with no satisfaction. Guides are everywhere. I HTH
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Click to collapse
Thank you for your reply
I managed to flash the firmware few times,but the phone keeps freezing after some time and restarts.Sometimes it is stuck in the bootloop,sometimes it starts up to some point,freezes and restarts.
Could it be BAD BATTERY or is it something else?
If it is the battery problem,I will replace it,but I'm afraid that it might be someting else wrong.
What is your opinion?