Develop Bugs

D855 Stuck in Bootloop-- Light Sensor and Vibration Still Work

I'm having a weird problem. Yesterday I was using my phone as I normally do-- texting, playing simple puzzle games, etc.-- when I noticed the battery was at about 2%. I wasn't very concerned so I tried to send one last text before it died. Shortly afterward it died with the usual "Powering Down" alert. I thought absolutely nothing of it and once I had access to a charger, I did what I normally do: I turn on my phone, wait for it to get past the LG splash screen, and I plug it in once it gets to the boot animation. I do this so my phone will turn on instead of going into charge only mode. Also, like usual, my phone's screen dimmed seconds after the boot animation began (I assume from my automatic light sensor settings), and I could feel it vibrating a little (also something it typically does upon boot).
However this is as far as it got. I was very confused when about an hour later, the phone still hadn't completed boot. I removed the battery, inserted it again, and tried once more telling myself that I would wait as long as I could instead of just an hour. Booting the second time gave me identical results-- everything is normal (light sensor response and vibration indicating the phone is powering on) yet it gets stuck. The only difference is that this time I got to see the entire bootloop.
After the boot animation screen has run for a while, I get the usual "Android is starting.... Optimizing app ## of ##" (#= actual numbers). Once it finishes, instead of booting my phone, it begins the boot animation again. If left alone it will cycle between the boot animation and the "Android is Starting" screen indefinitely.
TL;DR:
1. ) Caught in bootloop between boot animation screen and "Android is Starting... Optimizing app ## of ##" screen.
2. ) The screen still dims and there are little vibrations that usually tell me the phone is about to turn on.
I have tried:
- a hard reset- this yields only a slightly stronger vibration and it starts the bootloop again.
- Download mode- this does the same as the hard reset
- Removing battery for a while- no results
- Full charge to completely dead to full charge again on charge only mode- no results
I am running CM13 Nightlies from late February (not completely sure which exact date). Which I flashed without issue about a month ago. I do have Xposed and run various modules, but I was using nothing at the time and hadn't for about a month. My computer recognizes my phone as an LG G3 Device, but refuses to access any files.
Any help would be greatly appreciated!!

Phone not starting.
First remove phone battery, insert it again, do not start phone. Connect your phone to original charger and charge it, while charging with the charger start your phone. Your phone should start if yes/no report me immediately. Your phone battery is failing to start your phone (Due to Low Voltage in battery). Replace with original battery.

jit1108 said:
First remove phone battery, insert it again, do not start phone. Connect your phone to original charger and charge it, while charging with the charger start your phone. Your phone should start if yes/no report me immediately. Your phone battery is failing to start your phone (Due to Low Voltage in battery). Replace with original battery.
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Click to collapse
Alright, I removed the battery, reinserted it (without turning the phone on) plugged it into the wall charger (seeing the charge only battery animation), and attempted to turn it on. Whenever I try to turn my phone on after plugging it in, I get the LG splash screen followed by the battery charging animation. It never reaches the boot animation. I'll let it charge for a while and try again.
Thank you for the advice!

Okay, I let the phone charge completely and attempted to turn it on whilst plugged into the wall charger again. Unfortunately I had the same issue. The phone shows the LG splash screen and then the battery charging animation again-- no boot animation.

musiceas66 said:
Okay, I let the phone charge completely and attempted to turn it on whilst plugged into the wall charger again. Unfortunately I had the same issue. The phone shows the LG splash screen and then the battery charging animation again-- no boot animation.
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Click to collapse
just start with a full reflash , if it doesnt boot up its simply broken

Jhinta said:
just start with a full reflash , if it doesnt boot up its simply broken
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Click to collapse
Yeah, I'm trying to avoid a full reflash/data wipe. Since I haven't messed around with any Xposed modules or root apps, I also haven't backed up anything for quite a while. No abnormal apps were running before the battery died, which leads me to believe this can be solved somehow without a full wipe.
Also, I tried to use my boyfriend's battery to boot up my phone. I thought it might be a bad battery-- as some people on-line have mentioned. Unfortunately, it still refused to boot and it produced the same bootloop.

You see , if and not and this and that dont help . te only way to save files is to get acces by recovery or boot, you cant boot but possible you have recovery so start saving your files you need. when you have or dont have your files . you stil need your system to boot for that to happen, it needs to work. so flashing a default rom with wipe sould work if it doesnt you flash original if that doesnt work its dead
Verstuurd vanaf mijn LG-D855 met Tapatalk

I think I forgot to mention, I cannot access recovery mode. I have the latest TWRP installed, but attempting to boot into recovery gives me the same results-- endless bootanimation/ "Android is Starting" bootloop.

So no acces at all . so what do you do ? Read above! Anyway good luck
Verstuurd vanaf mijn LG-D855 met Tapatalk

Solved
I fixed my problem. It turns out I was being an idiot and got the method of entering recovery mode on the LG G3 confused with my Samsung tablet. I should be able to fix the bootloop on my own now. Thanks everyone for your help! Cheers to idiocy.

Hey, I have the exact same issue right now. Did you solve your problem, and how? I tried removing the battery and charging with original charger to 100%. I connected it to my PC, went into Download mode and clicked "Restore Upgrade Errors" in LG PC Suite. It successfully flashed the firmware update, then it said "Android is starting.... Optimizing app ## of ##". But after that it restarted into bootlop again. Also I noticed that sometimes it vibrates, and my LED (light sensor) doesn't light up anymore.
Any advice? I haven't tried replacing the battery yet.

simon710 said:
Hey, I have the exact same issue right now. Did you solve your problem, and how? I tried removing the battery and charging with original charger to 100%. I connected it to my PC, went into Download mode and clicked "Restore Upgrade Errors" in LG PC Suite. It successfully flashed the firmware update, then it said "Android is starting.... Optimizing app ## of ##". But after that it restarted into bootlop again. Also I noticed that sometimes it vibrates, and my LED (light sensor) doesn't light up anymore.
Any advice? I haven't tried replacing the battery yet.
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Click to collapse
Hi i have the same problem with my lg g3 d855, after a reflash hi is start and do android optimazig after the tel is start and do this over and over. help please

Hi, the solution that worked for me was to
1. install drivers
2.install LGUP
3.flash "LGD855P_D855P10a_04" - found here https://drive.google.com/file/d/18tlmVNK_ba0jIapJy-Sz5wamxbIXh8xH/view

Nexus 5X mixed boot loop & hard brick after replacing screen

tl;dr summary:
- Replaced screen, worked for 1 week
- Randomly switches between hard-brick no response, and soft-brick boot loop
- Boot loops on loading TWRP as well as OS
- Running latest 7.0.0 NBD90W
- Phone is H790 variant
- Flashed Android 7 in the bootloader, not through OTA. This was as soon as Nougat came out, and it worked great for weeks.
- Bootloader unlocked (for temp-booting twrp only, "fastboot boot twrp.img" otherwise kept stock)
- Phone NEVER rooted
- No charging indicator when plugged in
- Battery bent during previous removal, maybe causing issues a week later?
Replaced screen with genuine LG front frame assembly after a running accident cracked my screen/digitizer. Phone worked fine for about a week, then randomly shut off and went into a boot loop.
Now it randomly switches between a boot loop and a hard brick. When it's acting like a hard brick, sometimes it goes back into boot loop temporarily if I disconnect and reconnect the battery. It eventually returns to hard brick.
Hard brick mode:
-- Doesn't respond to any power button presses. Does not indicate charging when plugged in. Entirely unresponsive.
Soft brick mode:
-- Normal boot: normally gets to Google logo and restarts. Rarely makes it to the flashing dot animation. Twice has booted into Android, past the lock screen, and works perfectly for ~10-15 seconds before rebooting.
-- Boot into bootloader: On occasion will reboot itself from bootloader, but rare. Usually works correctly including all adb commands.
-- Boot into stock recovery: Same as bootloader, usually works, sometimes reboots.
-- Boot into TWRP 3.0.2-2 bullhead: boots for a few seconds and then locks up. Has never made it through decryption - will either a) freeze and reboot right after I draw my pattern, throwing an error that it could not mount storage right before restarting or b) freeze and reboot anyway if I take too long before drawing my pattern. It seems to be more time-based than a function of anything I do.
Things I've tried:
Since my bootloader is unlocked, I've re-flashed these partitions with no fix:
bootloader.img
boot.img
recovery.img (stock)
radio.img
vendor.img
I've cleared cache through stock recovery, can't remember if I tried flashing cache.img
I have yet to flash system.img or userdata.img as I have a few files I'm trying to recover... The fact that I can't boot into TWRP, and the sporadic hard-brick behavior, doesn't give me enough confidence that wiping my data will help.
Phone tends to live in hard-brick mode unless I disconnect and reconnect the battery, then it sometimes goes into soft-brick boot loop for a while before once again hard-bricking itself. When hard bricked, no charging indicator appears when plugged in. When soft-bricked and turned off, will sometimes display the battery status after short-tapping the power button. No change when plugged in except only once it displayed the battery with lightning bolt icon for about 2 minutes, before returning to the icon without the lightning bolt.
My best guess is that I damaged the battery during removal.
- The adhesive was really strong, and while I didn't puncture the case, I did bend it somewhere between 30-45 degrees in the process. If I damaged the Li-Po foil, would that make sense for the phone to work, only to go belly-up a week later? I ordered an OEM LG battery for $13 because it's worth a shot at that price point. Arriving next week.
- The reboots sound in-line with it crashing when it tries to draw too much power? Bootloader and stock recovery usually run okay and I assume have a low power draw. The OS and TWRP probably draw more power and that's where it fails? The reboots seem to be more time-dependent than depending on anything in particular that I do, such as rebooting before OR after drawing my pattern on TWRP. And that it sometimes boots into full Android for a few seconds implies to me that the OS is working on at least some level.
Does anyone have any better ideas for when the new battery inevitably doesn't fix it, or things to try in the meantime? Could the common Nexus 5X boot loop under Nougat be causing issues booting into TWRP too? It feels hardware-related to me. I took it all apart and looked for loose/oxidized/bent contacts on all the connections but couldn't spot anything.
My Pixel isn't arriving until Nov 23-25, and to make matters worse I switched to Google Fi 3 days ago and I have no compatible phones to use in the meantime. Oops, lesson learned.

H815 does not start or enter recovery

Hi,
a few hours ago I dropped my G4 H815. The back fell off and the battery got out. I put the Battery back in and after a few tries I could load the device. However, I just can`t start the phone now. When I press the power Boutton, nothing happens.
When plugging in the microUSB-Cable the screen turns on and I sometimes see the screen with the LG Logo, but no matter how often I try, it does not boot into recovery (the volume down key was always a bit tricky though). It just goes on to the Screen saying your battery is loading and it´s at 100%.
I can reach Download-Mode, but I do not see any way to force a reboot from there.
My Bootloader is unlocked and the device is rooted. Im running TWRP and LineageOS 14.

Norkzlam said:
Hi,
a few hours ago I dropped my G4 H815. The back fell off and the battery got out. I put the Battery back in and after a few tries I could load the device. However, I just can`t start the phone now. When I press the power Boutton, nothing happens.
When plugging in the microUSB-Cable the screen turns on and I sometimes see the screen with the LG Logo, but no matter how often I try, it does not boot into recovery (the volume down key was always a bit tricky though). It just goes on to the Screen saying your battery is loading and it´s at 100%.
I can reach Download-Mode, but I do not see any way to force a reboot from there.
My Bootloader is unlocked and the device is rooted. Im running TWRP and LineageOS 14.
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Click to collapse
Well it sounds like the infamous Bootloop at least the symptoms are the same. The Bootloop issue is not caused by dropping the phone but while booting Android as this is a very CPU intensive process.
Ilapo or not I would take a backup with SALT before anything else.
You can also boot to fastboot and assuming you haven't installed the nougat v29 bootloader stack you can just boot TWRP temporary by using
fastboot boot twrp.img
(where twrp.img should be my latest TWRP version preview 144 or higher)
Sent from my LG-H815 using XDA Labs

No Bootloop. It seems like the power Button is broken. Using SALT I could reboot the phone and it starts and works normal. The knok-on feature makes this situation, at least temporally, bearable.
I will probably try to fix the Button.

Pixel 3XL - constant bootloop

So I updated to Android 11 on Tuesday, and all seemed fine. Last night my phone was trying to install an app, and seemed to freeze.
After a few minutes, I forced it to shut-down (power + vol down) and it started to reboot. It got to the G logo with the small bottom bar animation for a number of minutes and eventually kicked back into Recovery mode.
I decided to try rebooting, and it started to reboot, got to the Google logo (the full word, not the "G"), and then kicked back into rebooting.
The phone now constantly reboots and even if I get into fastboot mode, it only stays in fastboot until I hit a key (vol up/down or power) and it then reboots into constant bootloops described above.
If I don't push a button on fastboot mode, it will just start booting anyways after about 3-5 seconds.
Does anybody know of what I could do? Not sure if replacing the battery would help (e.g. a power issue) or if it may be a corruption of the flash memory and that the system and underlying partitions are corrupt leading to nothing I could do to repair the phone.
I have really enjoyed this phone, but I am afraid that this phone is all-but-dead and unusable.
Any assistance is greatly appreciated.
Cheers,
B.D.

You can try flashing the stock rom from recovery or from fastboot.

Had something similar on an og Pixel... Turned out to be a broken power switch.

I had a weird issue last week. Phone would freeze after a couple of minutes and would reboot. It would also boot loop while connected for charging (wireless and corded.). The battery would not charge. I would shut down the phone and when I plugged in the charger, it would boot loop. The battery finally discharged to 0% and shut off. I plugged the charger in and it remained off. I let it charge to 100% and it's been working for the past week without issue. I'm not sure what happened.
I would suggest letting the battery drain to 0% and go from there. HTH

I updated my 3XL to Android 11 two days ago and since then I have caught it rebooting at seemingly random times, though only when it is on the wireless charger. I guess it's back to Android 10 for now. Hopefully reverting a Pixel is as easy as it was on the Nexus. Thanks Google.

BostonDan said:
So I updated to Android 11 on Tuesday, and all seemed fine. Last night my phone was trying to install an app, and seemed to freeze.
After a few minutes, I forced it to shut-down (power + vol down) and it started to reboot. It got to the G logo with the small bottom bar animation for a number of minutes and eventually kicked back into Recovery mode.
I decided to try rebooting, and it started to reboot, got to the Google logo (the full word, not the "G"), and then kicked back into rebooting.
The phone now constantly reboots and even if I get into fastboot mode, it only stays in fastboot until I hit a key (vol up/down or power) and it then reboots into constant bootloops described above.
If I don't push a button on fastboot mode, it will just start booting anyways after about 3-5 seconds.
Does anybody know of what I could do? Not sure if replacing the battery would help (e.g. a power issue) or if it may be a corruption of the flash memory and that the system and underlying partitions are corrupt leading to nothing I could do to repair the phone.
I have really enjoyed this phone, but I am afraid that this phone is all-but-dead and unusable.
Any assistance is greatly appreciated.
Cheers,
B.D.
Click to expand...
Click to collapse
Are you familiar with how to use commands in platform-tools to flash stock images? How did you upgrade? OTA? Are you rooted? Is it unlocked or Verizon variant? If unlocked, do you know how to unlock the bootloader?

jjlane86 said:
Are you familiar with how to use commands in platform-tools to flash stock images? How did you upgrade? OTA? Are you rooted? Is it unlocked or Verizon variant? If unlocked, do you know how to unlock the bootloader?
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Click to collapse
I am proficient in using the bootloader. Phone has been bootloader unlocked since day one.
I upgraded to Android 11 with ota and all was good for a day (rooted with Magisk canary). Then the phone started acting up, first not booting system and then bootlooping.
I can get into the bootloader (fastboot) but only for maximum 3-5 seconds before the phone reboots, or if I hit any button (vol up/down) the phone reboots. Also, if connected to my computer the USB does not recognize fastboot anymore (before it reboots anyways)
I think it's dead, Jim.
Cheers,
B.D.

Phone won't boot up or charge

Hello there Beautiful People,
Yesterday i tried to root one of my former phone as a test if i could root current one cause im interested in it, it was my first to root, i was able to unlock oem and everything after i tried to flash the magisk image i accidentally wrote it to the system partition instead of boot one and i was stuck in a boot loop, i figured that too after booting into Recovery Mode and after that i went for the "Power Off" mode and after that my phone stopped booting and charging, i just wonder if there's anything i could do with it or its now completely dead forever. Thank You for your time.
UPDATE: i was able to bring it back to life after 5 hours of suffering.

Try changing the battery outside the phone on a stand-alone charger or in another phone.

Salvadorfreeman said:
Try changing the battery outside the phone on a stand-alone charger or in another phone.
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Click to collapse
i tried that, phone shows no sign of turning even though i pressed power button and volume down button at the same time for about 5 minutes

UPDATE: i was able to bring it back to life after 5 hours of suffering.