Develop Bugs

[Q] Phone freezes after few seconds on startup.

Hey everyone, I am facing a weird problem.My phone freezes after few seconds on startup. Everything works normal for FEW seconds and than phone freezes and it reboots.I was on TWRP.I wiped cache,system,dalvik but it didn't fixed. Than i moved to cwm in a hope than it may fix the problem.I performed a clean install for flashing a rom(wipe system,cache......) but no :crying: .Than i also tried flashing different rom(domination) but that too didn't helped.
Overall i performed each n every possible method but none of them helped.
Note- I see some kind of lines on screen before my device hangs.And than my phone reboots(with battery dropped to zero).

mannyvinny said:
Hey everyone, I am facing a weird problem.My phone freezes after few seconds on startup. Everything works normal for FEW seconds and than phone freezes and it reboots.I was on TWRP.I wiped cache,system,dalvik but it didn't fixed. Than i moved to cwm in a hope than it may fix the problem.I performed a clean install for flashing a rom(wipe system,cache......) but no :crying: .Than i also tried flashing different rom(domination) but that too didn't helped.
Overall i performed each n every possible method but none of them helped.
Note- I see some kind of lines on screen before my device hangs.And than my phone reboots(with battery dropped to zero).
Click to expand...
Click to collapse
Use fastboot and flash back to stock. See if that solves it. If not, it is possible it is a hardware issue.

cupfulloflol said:
Use fastboot and flash back to stock. See if that solves it. If not, it is possible it is a hardware issue.
Click to expand...
Click to collapse
please don't scare me :cyclops: coz this phone isn't officially launched in India so that I can walk to service centre and get my phone replaced.If its a hardware issue than my phone is surely dead.
BTW,my phone was working just normal 2 days back when i restored a backup from twrp.It all started when i restored backup from twrp as I messed up bootanimation.

plz help me guys..is no one available here to help me out :'(

mannyvinny said:
plz help me guys..is no one available here to help me out :'(
Click to expand...
Click to collapse
Did you try flashing back to stock like I suggested previously?

cupfulloflol said:
Did you try flashing back to stock like I suggested previously?
Click to expand...
Click to collapse
no.coz i would loose all my sd data too

mannyvinny said:
no.coz i would loose all my sd data too
Click to expand...
Click to collapse
Back it up to your PC prior to using fastboot.

cupfulloflol said:
Back it up to your PC prior to using fastboot.
Click to expand...
Click to collapse
now my phone doesn't even starts! its bootlooping..i've very important stuff in my sd card which i don't want to loose.and flashing stock will surely wipe EVERYTHING
Anyway to recover sd card data?
note-i can access recovery and bootloader:good:

mannyvinny said:
now my phone doesn't even starts! its bootlooping..i've very important stuff in my sd card which i don't want to loose.and flashing stock will surely wipe EVERYTHING
Anyway to recover sd card data?
note-i can access recovery and bootloader:good:
Click to expand...
Click to collapse
You can use ADB in a custom recovery.

cupfulloflol said:
You can use ADB in a custom recovery.
Click to expand...
Click to collapse
I flashed the stock image and locked the OEM but the problem still persists

[Q] Maguro rebooting radomly

Dear community,
i have a reboot problem with my gnex gsm for several weeks now. The phone seems to be rebooting randomly after freezing. The only situation where no reboot occurs is when it is attached to the pc via usb docking station in developer mode.
Ususally, i had cyanogenmod nightlies installed, but i also tried stock 4.2.2 and 4.3 images. Moreover i tried several full wipes using cwm and twp recovery. After the last wipe, I did not recover anything using titanium backup. At the moment i am running on 4.3 stock image and stock recovery with no root. Bootloader is still unlocked. The phone keeps rebooting...
Has anybody an idea where to locate the problem (probably some certain log files) ?

My GNex had that problem. It started with random reboots. Then got into a boot loop from which it never recovered.
Good luck. Hope you don't have the same fate that I had.
Try flashing back to stock and lock and unlock bootloader. If that doesn't stop the reboots, IMO, time to look for a new phone.
Edit : You might want to send it to Samsung for repair, if you are still under warranty.
Sent from my Micromax A116 using Tapatalk 2

Check battery connections, replace battery
Update us later

viskon said:
My GNex had that problem. It started with random reboots. Then got into a boot loop from which it never recovered.
Good luck. Hope you don't have the same fate that I had.
Try flashing back to stock and lock and unlock bootloader. If that doesn't stop the reboots, IMO, time to look for a new phone.
Edit : You might want to send it to Samsung for repair, if you are still under warranty.
Sent from my Micromax A116 using Tapatalk 2
Click to expand...
Click to collapse
I've already tried your suggestion, but it didn't help.
Actually, I'm still under warranty, but i was hoping to solve the problem by myself to avoid being without phone for a few weeks.
beekay201 said:
Check battery connections, replace battery
Update us later
Click to expand...
Click to collapse
Already tried that, i have a replacement battery. By the way, the reboot problem also occurs when charging from the normal power supply. Only the usb connection with debug mode avoids rebooting.
Thank you for your advice.

CStauch said:
Already tried that, i have a replacement battery. By the way, the reboot problem also occurs when charging from the normal power supply. Only the usb connection with debug mode avoids rebooting.
Thank you for your advice.
Click to expand...
Click to collapse
Okay, so what do you think you can do next? That replacement battery, is it a stock battery?

beekay201 said:
Okay, so what do you think you can do next? That replacement battery, is it a stock battery?
Click to expand...
Click to collapse
Yes, it is not distiguishable from the original one.
I was hoping, that there can be any hint in some sort of log file or something.

Have you tried booting into safe mode to see if it is an app issue?
http://www.talkandroid.com/guides/b...or-tablet-into-safe-mode-for-troubleshooting/
Sent from my Micromax A116 using Tapatalk 2

viskon said:
Have you tried booting into safe mode to see if it is an app issue?
Sent from my Micromax A116 using Tapatalk 2
Click to expand...
Click to collapse
Just tried that, also no difference

Are you using the original cable to charge it? I've had problems where using cheap ebay cables made the touchscreen all jumpy and needed a reboot to fix. I changed to the original cable and it never happened again. Dont know if you could have a similar problem but with random reboot.

AzNxJoHnNy said:
Are you using the original cable to charge it? I've had problems where using cheap ebay cables made the touchscreen all jumpy and needed a reboot to fix. I changed to the original cable and it never happened again. Dont know if you could have a similar problem but with random reboot.
Click to expand...
Click to collapse
I'm using both the original cable and two docking stations from amazon, one with ac/dc adaptor and one with usb. The phone always reboots no matter if it is charging or not. Only when connected to usb in debug mode, there is no reboot.

CStauch said:
Just tried that, also no difference
Click to expand...
Click to collapse
I strongly suspect a hardware issue. You might be better off sending it for warranty repair.
Sent from my Micromax A116 using Tapatalk 2

SAME PROBLEM!
Tried with several ROMs and Kernels, also stock, disabling proximity sensor (there is someone with this sensor issue...) but nothing changed.
Now I made a fuuuul hard deep wipe, and installed AOKP ROM with Nexus Toolkit. I have to check if it will be working, if not I'm going to restore phone to stock (locked unrooted etc) and then try...

Same problem here.

This happened also to me on August... was an hardware issue for me

TKPL said:
SAME PROBLEM!
Tried with several ROMs and Kernels, also stock, disabling proximity sensor (there is someone with this sensor issue...) but nothing changed.
Now I made a fuuuul hard deep wipe, and installed AOKP ROM with Nexus Toolkit. I have to check if it will be working, if not I'm going to restore phone to stock (locked unrooted etc) and then try...
Click to expand...
Click to collapse
Still not working... I wiped everything and restored phone to stock locked, and got, in one day, "only" one reboot and two super-lag (it's better than before but it's not good). I gonna send it back to assistance...

TKPL said:
Still not working... I wiped everything and restored phone to stock locked, and got, in one day, "only" one reboot and two super-lag (it's better than before but it's not good). I gonna send it back to assistance...
Click to expand...
Click to collapse
I had the same problems... i've tried to make a clean installation of the stock factory image ... sent to assistance.. it was an hardware issue...
Have You tried to use the flash-all.bat to restore the factory image, the executable inside the factory image archive that flash the stock image automatically... try it

enricocid said:
I had the same problems... i've tried to make a clean installation of the stock factory image ... sent to assistance.. it was an hardware issue...
Have You tried to use the flash-all.bat to restore the factory image, the executable inside the factory image archive that flash the stock image automatically... try it
Click to expand...
Click to collapse
I reflashed with the Nexus Root Toolkit the factory image, so I guess it made automatically the flash-all.bat.
Tomorrow I'm sending the phone to assistance

enricocid said:
This happened also to me on August... was an hardware issue for me
Click to expand...
Click to collapse
So What was the hardware issue because i have the same problem and out of warranty..... And I would like to repair the phone.
If the costs aren't to high.

It is happening to my gnex since yesterday.
I was on shiny Rom and all of a sudden it began rebooting randomly.
Looking at the last_kmsg I found a kernel panic related to I/o error of the ext4-fs (or something similar).
I performed several wipe, thinking of a kernel issue.
It continued rebooting randomly so I completely reset to stock 4.3 including format of sdcard.
I have the feeling that reboots began when the sdcard began to fill.
I also re_locked the bootloader, but reboots still occur.
It is probably a faulty Emmc chip, I will go to the store for warranty.
Lionhe
Inviato dal mio Galaxy Nexus utilizzando Tapatalk

ROOTED VZ G4 Bootloop - Will this break my warranty?

XDA,
I just got into a bootloop while on the Facebook App and I pressed the home button. I read that it happens to random people, but I want to make sure that I am safe.
I rooted roughly 5 months ago, when I got this phone and I've never had an issue.
What are my options? If I call VZ/LG will they accept my rooted phone? Or can I fix this bootloop? Will using this method http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848 help me ?
Thank you,
-J
EDIT: My phone booted up, the apps were optimizing, but then it just rebooted back to the LG screen and now it's stuck there.

[removed by dentralp]

dentralp said:
Don't want to do fear mongering just keep people in the know...
If you are stuck on LG screen you could have the same issue as;
http://forum.xda-developers.com/g4/help/lg-g4-stuck-bootloop-t3268734
I had full bootloops apart from when MM was installed, it just sat there on the LG logo. Could be that your on MM with the issue?
I have tried LG Bridge, Flash Tool and LG Up with various different roms, both LP and MM nothing worked.
Mine is also Rooted, with the bootloader unlocked. LG UK have been sat with my phone for over a month - hopefully I will find out soon if they have fixed it using the warranty - but even if they do, mine is with LGUK not LGUS ...
Think what I am trying to say is, try all the methods and if it doesnt work send it for RMA with your fingers crossed :/
Click to expand...
Click to collapse
Just so I understand you, I basically have to RMA my phone? All the other options seem like they resulted in a bootloop. And RMA I'm assuming you mean using warranty?
And I'm not on MM.
Just out of curiosity, would the fact that I rooted my phone disqualify me for using mywarranty?

I guess you rooted with injected system.img. If you can go to download mode you could write the original system.img back, so then you are not rooted. Or you could write a KDZ file in LGUP.

ObiDanKenobi said:
I guess you rooted with injected system.img. If you can go to download mode you could write the original system.img back, so then you are not rooted. Or you could write a KDZ file in LGUP.
Click to expand...
Click to collapse
As far as I'm aware, simply restoring an original unrooted system.img backup will still show "Modified" in the download mode status, once it's been rooted. The only way to clear that status is by flashing the KDZ. (You can still keep your personal data with that option though.)

iamjerry123 said:
XDA,
I just got into a bootloop while on the Facebook App and I pressed the home button. I read that it happens to random people, but I want to make sure that I am safe.
I rooted roughly 5 months ago, when I got this phone and I've never had an issue.
What are my options? If I call VZ/LG will they accept my rooted phone? Or can I fix this bootloop? Will using this method http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848 help me ?
Thank you,
-J
EDIT: My phone booted up, the apps were optimizing, but then it just rebooted back to the LG screen and now it's stuck there.
Click to expand...
Click to collapse
Based on what I've read in the main bootloop thread, the bootloop issue is a hardware problem that requires the phone motherboard to be replaced so I don't think they will be able to detect the root during the RMA process:
...
I have received confirmation from LG that series from May, June, July and August are afflicted by this issue and that the revision number doesn't matter. They also said that it is not necessary that all phones in these series will fail, but that under certain circumstances (not disclosed to me) they will start producing the bootloop issue which is h/w bound.
...
Update: It seems not all bootloops are due to deffective motherboard as on some phones they were able to detect the root and refused the repair under warranty.
So maybe for some G4's stuck in bootloop there might be a solution to be soft repaired.
I saw this in another thread, can you try this?:
...
Using DL mode (device off -> press and hold volume up while(!) connecting to PC) and LGUP you should be able to push any KDZ on your device and get out of the boot loop.
...
I don't have the bootloop problem so I can't test it but it might.
What's the build date of your G4 (between May-August 2015?)? What are the 1st 3 digits of your phone's S/N?

If you root any phone you automatically void your warranty. There's no exception to this and I actually understand why they do that because most people don't need to be rooting their phones lol but if u find a KDZ you're str8, use the flashtool and you'll never get into a permanent bootloop and you can use your warranty. But most likely something you modified or something another app was doing caused the bootloop not a hardware issue. Also it'd probably the last thing you ever even thought that caused it lol
Sent from my VS986 using Tapatalk

Have you tried a hard factory reset? Usually helps

Phone stuck on LG start up

Hi, I have cynogen installed and all was working fine until this morning, noticed my phone appeared to be booting up, gets to the blue circle then goes black and goes back to the LG screen, then repeats. Ive never been able to get into recovery by pressing the power and vol button and have tried numerous times with no joy. I know i can boot into recovery using ADB but the phones needs to be on doesnt it? Is there any other way that I can do this? Please help been with out my phone all day! Feel lost lol

foxguard said:
Hi, I have cynogen installed and all was working fine until this morning, noticed my phone appeared to be booting up, gets to the blue circle then goes black and goes back to the LG screen, then repeats. Ive never been able to get into recovery by pressing the power and vol button and have tried numerous times with no joy. I know i can boot into recovery using ADB but the phones needs to be on doesnt it? Is there any other way that I can do this? Please help been with out my phone all day! Feel lost lol
Click to expand...
Click to collapse
you could do 2 things.. one download KDZ use LGUP flash it and see if it was software related or something went wrong at flash.. if it keeps doing it then it has the bootloop issue.. and need to be sent back for repair....can you provide your first 3 digits of your serial number...?

raptorddd said:
you could do 2 things.. one download KDZ use LGUP flash it and see if it was software related or something went wrong at flash.. if it keeps doing it then it has the bootloop issue.. and need to be sent back for repair....can you provide your first 3 digits of your serial number...?
Click to expand...
Click to collapse
Thank you, will look at this kdz, is it simple to use?
it has been working fine on cynogen for last few months, nor changed anything
s/n is 508

foxguard said:
Thank you, will look at this kdz, is it simple to use?
it has been working fine on cynogen for last few months, nor changed anything
s/n is 508
Click to expand...
Click to collapse
yes it is its pretty easy... . file is big though... download kdz for you variant.. what android you are using.? MM or were you on stock LP.?
well i think since your phone is from 2015 august. that bootloop was supposed to be fixed by then. but newer phone are still getting hit by the bootloop.. but be aware unlocking the bootloader voids warranty.. some been lucky that phone were repaired some were denied repair..

raptorddd said:
yes it is its pretty easy... . file is big though... download kdz for you variant.. what android you are using.? MM or were you on stock LP.?
well i think since your phone is from 2015 august. that bootloop was supposed to be fixed by then. but newer phone are still getting hit by the bootloop.. but be aware unlocking the bootloader voids warranty.. some been lucky that phone were repaired some were denied repair..
Click to expand...
Click to collapse
Its been unlocked for ages and running the cyanogen rom, this is what is now stuck but was running fine. lg website doesnt have the programme any more, will hunt for it. so this will work even though phone doesnt boot?

foxguard said:
Its been unlocked for ages and running the cyanogen rom, this is what is now stuck but was running fine. lg website doesnt have the programme any more, will hunt for it. so this will work even though phone doesnt boot?
Click to expand...
Click to collapse
her it is..
http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803
http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848
here are the links but i think you got the BOOTLOOP problem that many been affected..
NO ...... the only way for your phone to boot and gather all data is to flash a moddedKDZ.. but am not sure if it works on your variant..
if you have warranty send it back...but if they find out its unlocked they may deny repair.. you must pay for it...
this will make it boot but it will make it slow. as it disables the main cores...
https://www.reddit.com/r/lgg4/comments/45gfg2/dae_g4_series_msm_big_core_disable_tool_guide/
read this post..
http://forum.xda-developers.com/g4/help/lg-g4-stuck-bootloop-t3268734

raptorddd said:
her it is..
http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803
http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848
here are the links but i think you got the BOOTLOOP problem that many been affected..
NO ...... the only way for your phone to boot and gather all data is to flash a moddedKDZ.. but am not sure if it works on your variant..
if you have warranty send it back...but if they find out its unlocked they may deny repair.. you must pay for it...
this will make it boot but it will make it slow. as it disables the main cores...
https://www.reddit.com/r/lgg4/comments/45gfg2/dae_g4_series_msm_big_core_disable_tool_guide/
read this post..
http://forum.xda-developers.com/g4/help/lg-g4-stuck-bootloop-t3268734
Click to expand...
Click to collapse
Going to give this a whirl now mate, thanks.

LG G3 Bootloop and random restarts

So I was on holiday in London recently and i left my phone charging for a while, when i went to use it to check my texts all of a sudden it froze and got stuck in a bootloop.
After coming back from my holiday i bought a new battery which didnt fix the problem. Sometimes the phone manages to boot up but its either laggy or it ends up restarting into a bootloop eventually. I have tried everything, hard reset, upgrading to 6.0, flashing, and nothing seems to work.
I dont know what else to do at this point, is my phone screwed or am i missing something?
LG D855

find any fix
tried new battery but no luck
factory reset and re-flash

Same here
I have the exact same problem my lg g3 d855 would randomly restart or/and bootloop. I did everything I wiped dalvik cache data even internal storage and started from scratch. It stopped for a while but then again it started to do the same thing. If you find any solution let me now.

This happened to me last night :crying:

lovetatfitties said:
This happened to me last night :crying:
Click to expand...
Click to collapse
Happened same time to a friends LG G3
i just fixed it doing this
Download and install lg drivers for pc http://oceanhost.eu/ed0bnrnghgef/LGUnitedMobileDriver_S51MAN312AP22_ML_WHQL_Ver_3.12.3.exe.htm
Boot phone into download mode (turn phone off, Plug usb cable in first then hold power & volume up immediately after)
Run the program in attatched "B2CAppSetup.rar" and start the update process

EasyAndroidPro said:
Happened same time to a friends LG G3
i just fixed it doing this
Download and install lg drivers for pc http://oceanhost.eu/ed0bnrnghgef/LGUnitedMobileDriver_S51MAN312AP22_ML_WHQL_Ver_3.12.3.exe.htm
Boot phone into download mode (turn phone off, Plug usb cable in first then hold power & volume up immediately after)
Run the program in attatched "B2CAppSetup.rar" and start the update process
Click to expand...
Click to collapse
It worked... Kinda. Now the WiFi/BT doesn't work. This is probably hardware related so I think it's time to move on, but thanks anyways!

lovetatfitties said:
It worked... Kinda. Now the WiFi/BT doesn't work. This is probably hardware related so I think it's time to move on, but thanks anyways!
Click to expand...
Click to collapse
I think this was caused by a virus or bad update. before I updated my friends I managed to get it to to boot once and the Wi-Fi did not work either after update Wi-Fi still did not work. Which would explain why this happened at the same time to multiple people... tried everything to fix Wi-Fi nothing would work he ended up sending it back for replacement under warranty.
All the flash does is update it to the latest android which would not cause the Wi-Fi problem

jimmyjim11 said:
find any fix
tried new battery but no luck
factory reset and re-flash
Click to expand...
Click to collapse
I cant believe this, I was looking at a post i made on another forum a while back and someone said the sd card was corrupted, so i removed the sd card and Lo and ****ing behold my phone is working perfectly again. Somehow the SD card is corrupted or something while still functioning. hopefully this helps, i dont get why this isnt suggested in LGs official troubleshooting guide, ridiculous.

downgrade to kitkat 4.4.2 stock rom
For LG G3 boot loop issue, only downgrading to stock ROM KitKat 4.4.2 worked for me. Newer android releases seem to cause hardware conflicts with this model, especially while using Wi-Fi and enter in a boot loop. To downgrade, I used LGUP Tool and a suitable kdz file as LG stock firmware which you can find after some research on the net.