Brick Phone after Root - G4 Q&A, Help & Troubleshooting

Hello,
at first i am sorry for my englisch. I will give my best to write without any mistakes.
I have a big problem. I unlocked the bootloader on my LG g4 than I am gonna installed TRWP. Suddenly i couldnt boot my phone again.
I see only the branding logo. I ve tried to make a hardreset with the power and volume down buttom, but the phones is stuck at the branding logo.
I have also an access to downloading mode. I also tried to install a other firmware, but with LG Flash tool its not possilbe. It gives me during the installation an error. "Upgrade stopped due to an error".
Have i any possiblities to unbrick my phone ?? My currently software was Android 6 815.20A. Please help me to find out any solutions.
thanks

michael2412 said:
Hello,
at first i am sorry for my englisch. I will give my best to write without any mistakes.
I have a big problem. I unlocked the bootloader on my LG g4 than I am gonna installed TRWP. Suddenly i couldnt boot my phone again.
I see only the branding logo. I ve tried to make a hardreset with the power and volume down buttom, but the phones is stuck at the branding logo.
I have also an access to downloading mode. I also tried to install a other firmware, but with LG Flash tool its not possilbe. It gives me during the installation an error. "Upgrade stopped due to an error".
Have i any possiblities to unbrick my phone ?? My currently software was Android 6 815.20A. Please help me to find out any solutions.
thanks
Click to expand...
Click to collapse
Check if you can use LGUP while in download mode.

thanks
Thank you very much. I resolved the problem with LGUP.

Related

[Q] LG G3 security error

Just got the phone today and successfully rooted it and I wanted to see what this xposed framework stuff was about I installed the experimental version (tbh did really read it was experimental it was on the front page so I thought it was alright) and when prompt to reboot I did, but now when rebooting I can't get passed the Lg secruity error screen I tried re-flashing back to stock using this thread http://forum.xda-developers.com/showthread.php?t=2799647 but nothing happens after I plug my G3 back in it just says ready is there any other way to fix this security error?
edit:found out that my model number is actually the f400s (sorry i'm a phone noob) for anyone else out there trying to find your phone model it's actually behind the battery
Kebito said:
Just got the phone today and successfully rooted it and I wanted to see what this xposed framework stuff was about I installed the experimental version (tbh did really read it was experimental it was on the front page so I thought it was alright) and when prompt to reboot I did, but now when rebooting I can't get passed the Lg secruity error screen I tried re-flashing back to stock using this thread http://forum.xda-developers.com/showthread.php?t=2799647 but nothing happens after I plug my G3 back in it just says ready is there any other way to fix this security error?
edit:found out that my model number is actually the f400s (sorry i'm a phone noob) for anyone else out there trying to find your phone model it's actually behind the battery
Click to expand...
Click to collapse
do you have a picture of the error
suljo94 said:
do you have a picture of the error
Click to expand...
Click to collapse
Again I ended up resolving the issue myself and I do not have a picture of the error but I can describe it. When booting my lg g3 the normal big Lg logo appeared then after a bit a smaller lg logo appeared with the words "security error" under it for those looking for a solution to that problem the thread in the op is the correct action to take to resolve the issue. Note doing that wiped everything on my phone which was not a big deal for me but I had to take my phone back the the carrier to input the configuration to access 4g lte again & it unrooted my phone.
i have this same issue can you tell me how you got around it?
jerimynal wiley said:
i have this same issue can you tell me how you got around it?
Click to expand...
Click to collapse
jerimynal wiley the error you get "secure boot error" is caused by image you are trying to boot not being bumped or not properly flashed. I assume you get this error both while trying to access recovery and OS. If that is the case you should use this guide:
http://forum.xda-developers.com/showthread.php?t=2785089&nocache=1
to flash stock firmware on your device.
But if you have a case where you are able to access your recovery (TWRP I assume) you could use one of the custom images provided here: http://forum.xda-developers.com/lg-g3/development (assuming you have D855 version) . Flash them and use them as OS.
Thanks man. I actually could get into recovery so I just flashed another kernel
Sent from my LG-D850 using XDA Free mobile app
Lg G3 Security Error
Hi everyone.. I have problem with my Lg G3... I rooted my phone and when i make TWRP Reccovery, phone doesnt work.. Its says " LG Seccurity Error" and i can't go into download mode or recovery mode.. And when i connect with USB on my PC, PC cant find this device.. Can anyone help me?
Maryanohr said:
Hi everyone.. I have problem with my Lg G3... I rooted my phone and when i make TWRP Reccovery, phone doesnt work.. Its says " LG Seccurity Error" and i can't go into download mode or recovery mode.. And when i connect with USB on my PC, PC cant find this device.. Can anyone help me?
Click to expand...
Click to collapse
Same here..

[Q] Bootloop, and factory reset is stuck [SOLVED]

My device is rooted with towelroot, I installed supersu afterwards...
before bootloop I installed fontexplorer, and installed few fonts, it asked me to reboot, i rebooted, and now it just bootloop's all the time, LG animation and vibration, I can't get into fastmode, tried all kinds of button combinations..
When I try to factory reset, after pressing yes it shows erasing, and then it's stuck on boot logo, not animation..
Download mode is stuck also, just shows 0% but at least then pc's device manager shows com device found
How to fix this ?
All this happened after I rebooted my phone, before rebooting I installed few fonts with Font Installer ★ Root ★(com.jrummy.font.installer) app
THIS guide will help, you've softbricked, only in this guide you will of course need the dll and tot files for your phone and not Sprint. As long as phone comes on,computer recognizes it, and, it goes into dl mode, you should be good.
sent from my LG G3
rudolph323 said:
My device is rooted with towelroot, I installed supersu afterwards...
before bootloop I installed fontexplorer, and installed few fonts, it asked me to reboot, i rebooted, and now it just bootloop's all the time, LG animation and vibration, I can't get into fastmode, tried all kinds of button combinations..
When I try to factory reset, after pressing yes it shows erasing, and then it's stuck on boot logo, not animation..
Download mode is stuck also, just shows 0% but at least then pc's device manager shows com device found
How to fix this ?
All this happened after I rebooted my phone, before rebooting I installed few fonts with Font Installer ★ Root ★(com.jrummy.font.installer) app
Click to expand...
Click to collapse
That stinks huh?!
I've been using iFont and Fontster from the Play Store without any issues for future reference.
- Tapatalked from the G3
Mistertac said:
That stinks huh?!
I've been using iFont and Fontster from the Play Store without any issues for future reference.
- Tapatalked from the G3
Click to expand...
Click to collapse
G3s to me are finicky about changing or modifying. I modified one build prop setting, rebooted, same thing as op, mine wasn't bootlooping tho, but stuck on the big red 2 screen. Flashtool is your only friend at this point.
sent from my LG G3
Found similar topic about this.. it's jrummy app again, looks like most of his apps are corrupted..
http://forum.xda-developers.com/lg-l90/help/custom-boot-animation-boot-loops-d415-t2856718
Wow, I can't believe I fixed it, I thought it's impossible
I just went into download mode and used LG Flash Tool 2014 to flash to stock firmware..
joeyhdownsouth said:
THIS guide will help, you've softbricked, only in this guide you will of course need the dll and tot files for your phone and not Sprint. As long as phone comes on,computer recognizes it, and, it goes into dl mode, you should be good.
sent from my LG G3
Click to expand...
Click to collapse
If phone is not sprint, then KDZ method works too?
Sent from my LG-D855 using Tapatalk
newstar said:
If phone is not sprint, then KDZ method works too?
Sent from my LG-D855 using Tapatalk
Click to expand...
Click to collapse
I think I read back when I was unbricking that .KDZ files have to be converted to .tot, to use with this version of Flashtool.
Quick Question
Hey guys,
I am a bit of a rookie with rooting and i have an LG G3 for tmobile. I rooted my phone and had TWRP installed and accidentally attempted to install a software update and it soft bricked my phone. Here is my problem-all of the solutions i am finding for this issue require a PC, and I, unfortunately, am only running on mac software. I have no way to get lg flash on my mac and to make it comparable with my phone. Is there ANYONE who can help me? I am at my wits end and CANNOT believe I was so stupid as not to make a backup flash but I, as per usual, did not think about it at the time. If anyone could help me, I will be forever in your debt.
athena0729 said:
Hey guys,
I am a bit of a rookie with rooting and i have an LG G3 for tmobile. I rooted my phone and had TWRP installed and accidentally attempted to install a software update and it soft bricked my phone. Here is my problem-all of the solutions i am finding for this issue require a PC, and I, unfortunately, am only running on mac software. I have no way to get lg flash on my mac and to make it comparable with my phone. Is there ANYONE who can help me? I am at my wits end and CANNOT believe I was so stupid as not to make a backup flash but I, as per usual, did not think about it at the time. If anyone could help me, I will be forever in your debt.
Click to expand...
Click to collapse
I believe you can run virtual Windows on a Mac, not sure if it works with Flashtool though.
athena0729 said:
Hey guys,
I am a bit of a rookie with rooting and i have an LG G3 for tmobile. I rooted my phone and had TWRP installed and accidentally attempted to install a software update and it soft bricked my phone. Here is my problem-all of the solutions i am finding for this issue require a PC, and I, unfortunately, am only running on mac software. I have no way to get lg flash on my mac and to make it comparable with my phone. Is there ANYONE who can help me? I am at my wits end and CANNOT believe I was so stupid as not to make a backup flash but I, as per usual, did not think about it at the time. If anyone could help me, I will be forever in your debt.
Click to expand...
Click to collapse
Why so serious, use bootcamp and install windows 7 directly, and come into my debt.
Sent from my LG-D855 using Tapatalk
Unable to boot my rooted LG G3 S (beat), stuck at lg logo.
hello everyone. I recently rooted my lg g3 s (beat) D722K. After a few weeks I was trying to install apps as system apps using ES file explorer for which I had to copy the desired apk in the system/apps directory and restart the phone. it worked for a few apps (which I successfully made sys. apps) but not for a majority of apps . Everything was fine until now . After that I wanted to normally install an apk but the phone was unable to install it showing ' application not installed' . Then I tried to install other apps but got the same result . I decided to reboot my phone but it got stuck on lg logo and won't boot .
I tried to factory reset it using hardware keys but after wiping all the phone data it again got stuck on the same sucking LG logo .
I also tried to update firmware by connecting it to windows(8.1) pc in download mode which didn't work either. The firmware download got stuck at 0% everytime I tried.
please help me in getting out of this issue . I will heartily appreciate any help regarding this issue.
thanks.. in advance.

G3 stucks in Download Mode

Hello Community,
Yesterday my G3 stucked in a Bootloop without changing anything. Than I wanted to repair it with the LG PC Suite. This failed with the message "Assert" multiple times. Now it stucks in the download mode. Can I repair it? More important are the files on the G3. Is there a way to get them?
PJF16 said:
Hello Community,
Yesterday my G3 stucked in a Bootloop without changing anything. Than I wanted to repair it with the LG PC Suite. This failed with the message "Assert" multiple times. Now it stucks in the download mode. Can I repair it? More important are the files on the G3. Is there a way to get them?
Click to expand...
Click to collapse
Try this:
1) Remove battery
2) Hold down the power button for 30 seconds with the battery out
3) re-insert battery
4) Try turning it on again.
If that doesn't work, do a hard reset. You can find multiple posts on how to do it. Hope this helped!
Maybe I can help somebody with the same problem. I solved the problem with the following steps:
I setted up a new Windows 7 x64 PC. It must be Windows 7!!! No Windows 8 or other shiny things.
Installed the driver
Flashed a compleltely new firmware (.tot) over the old (!) FlashTool.
Hi guys. First, sorry my poor english. I'm Brazilian.
I make a firmware upgrade from LG PC Suite, 4.4 KK to 5.0 L. Problem is, the upgrade failed, and now my LG G3 are stuck in download mode. I try make this upgrade from LG Flash Tool but the problem persists, 65% appears in the screen of LG G3 a message "ASSERT" and reboot to download mode screen. Help, please?
plyndagos said:
Hi guys. First, sorry my poor english. I'm Brazilian.
I make a firmware upgrade from LG PC Suite, 4.4 KK to 5.0 L. Problem is, the upgrade failed, and now my LG G3 are stuck in download mode. I try make this upgrade from LG Flash Tool but the problem persists, 65% appears in the screen of LG G3 a message "ASSERT" and reboot to download mode screen. Help, please?
Click to expand...
Click to collapse
Although I have never come across this, using this site to download the right KDZ and using this thread to flash that KDZ may solve your problems. There is no harm done in trying this and you can be sure that it is the right file.
LG G3 Boot problems after download mode
Hello!
Sorry revive the topic but it was the only one who found a similar problem, after searching lot on google.
I have a LG G3 D855P. Yesterday he went out and restarted many times, but worked for a short time.
I can use the BoardDiag, but when I restore the D855P20C_00.kdz .kdz, to reach 36%, the cell phone goes off and does not return. I need to take the battery cable, so that it returns to the download screen, but still, to get 36% he goes again. Have made sure that the .kdz file works properly.
I followed the tutorial presented in this video.
/watch?v=gHAA5e2FQbU[
/watch?v=YsGHRKNT8EM
Porfavor guys, I'm desperate.
kernel adiutor. turn off cpu2 and 3. (notice it starts like CPU0,CPU1,CPU2,CPU3) you will thank me later.
let the 2475mhz max speed. set it on boot.
PJF16 said:
Hello Community,
Yesterday my G3 stucked in a Bootloop without changing anything. Than I wanted to repair it with the LG PC Suite. This failed with the message "Assert" multiple times. Now it stucks in the download mode. Can I repair it? More important are the files on the G3. Is there a way to get them?
Click to expand...
Click to collapse

[Q] My lg G4 STUCK ON DOWNLOAD MODE

my phone is not working
pilo99 said:
i think i accidently bricked my lg g4 ....now it is stuck on download mode , i tried to get to the stock recovery through the buttons ..volume down and power but it keep rebooting to download mode , plz any help will be appreciated
Click to expand...
Click to collapse
Have you pulled battery and turned back on?
pilo99 said:
i think i accidently bricked my lg g4 ....now it is stuck on download mode , i tried to get to the stock recovery through the buttons ..volume down and power but it keep rebooting to download mode , plz any help will be appreciated
Click to expand...
Click to collapse
i did pull the battery and waited 30 second and it is the same thing it keep going to download mode
pilo99 said:
i think i accidently bricked my lg g4 ....now it is stuck on download mode , i tried to get to the stock recovery through the buttons ..volume down and power but it keep rebooting to download mode , plz any help will be appreciated
Click to expand...
Click to collapse
more info is better than none, what did you do to "accidentally brick" your phone? and if you are stuck in download mode you could try the lg mobile support tool and re load the rom for your device.
zPacKRat said:
more info is better than none, what did you do to "accidentally brick" your phone? and if you are stuck in download mode you could try the lg mobile support tool and re load the rom for your device.
Click to expand...
Click to collapse
Thanks a lot , i dont think there is a room yet for lg g4 tmobile i looked every where for the kdz and tot file ...
pilo99 said:
Thanks a lot , i dont think there is a room yet for lg g4 tmobile i looked every where for the kdz and tot file ...
Click to expand...
Click to collapse
READ completely, including the link in 4 before starting!!!
download the tool using the lg d851, under t-mobile. the tool is generic, and can be found at lg.com under support/downloads
1. install LG Mobile Support Tool
2. run Tool, it will query lg for updates and do so if needed.
3. Install USB Driver (dismiss if you have done so already)
4. follow this process: http://forum.xda-developers.com/showpost.php?p=51268802&postcount=21 (use 5. below to put into download mode, not vol up and down like the link states)
5. with your device off, hold the volume up button while plugging in your USB cable with the Tool open.
6 you system will recognize the device and configure drivers, this will take a minute.
7. continue following the link in 4.
I ran into the same problem and now i'm stuck in downloadmode!
Does this method work? Or is there any other fix yet?
Thanks in advance!
schwederino said:
I ran into the same problem and now i'm stuck in downloadmode!
Does this method work? Or is there any other fix yet?
Thanks in advance!
Click to expand...
Click to collapse
no i did not fix mine yet i am on tmobile am not sure if they will consider return am still within retun policy
hey guys, don't ask for a different fix if you don't bother to explain how your phone got stuck in download mode. as for does this work? Why don't you try, it's the same tool used to upgrade firmwares instead of using OTA, and the link included shows how to get the tool to download the file (if it sees the same/current f/w it does not download the firmware) and you have nothing to loose, and this method is often used to recover from "soft bricking" your phone.
i was restoring my LG G3 to stock through the lg flash tool .....when i got through with it and restore was succesfull. somehow i forget the usb cable plugged through my pc usb port ...then connected my lg g4 that is where the flash tool got my Lg g4 on Downloade mode ....i tried all the methodes somehow i think the recovery is messed up .....i can get to the recovery through the button but it reboot straight to the download mode ....thanks every one for their support
pilo99 said:
i was restoring my LG G3 to stock through the lg flash tool .....when i got through with it and restore was succesfull. somehow i forget the usb cable plugged through my pc usb port ...then connected my lg g4 that is where the flash tool got my Lg g4 on Downloade mode ....i tried all the methodes somehow i think the recovery is messed up .....i can get to the recovery through the button but it reboot straight to the download mode ....thanks every one for their support
Click to expand...
Click to collapse
did you try what I listed earlier?
Yesi did every step and it does not seemto help.. Thanks again...
Yes i followed all the steps including reinstalling drivers and the lg mobile for the D851
Good luck, if you did the kdz there is the LG flash tool
zPacKRat said:
Good luck, if you did the kdz there is the LG flash tool
Click to expand...
Click to collapse
When did the kdz come out? You have link for this?
MicroMod777 said:
When did the kdz come out? You have link for this?
Click to expand...
Click to collapse
don't think it's out yet, however my statement was somewhat incoherent. I meant to say if he had the kdz, he could use the flash tool to recover his phone.
zPacKRat said:
don't think it's out yet, however my statement was somewhat incoherent. I meant to say if he had the kdz, he could use the flash tool to recover his phone.
Click to expand...
Click to collapse
Yea, at this point there no way to fix this without a kdz that I know of.
Call LG and tell them you need the kdz to restore your G4.
i was lucky, i had flashed twrp before my phone soft brick..
Sent from my unlocked and rooted LG-H815
I got an LG G4 which is stuck on lg screen. When I put it in download mode, it shows download mode for a few seconds and restarts. I was trying to flash ZVB over ZVD and it ended up like this. Model is ls991 . Any help would be really appreciated!
Anyone got any idea? The whole thing started with getting rid of the Genisys rom ... I did not like it ... I thought I was going to bring it back to the stock, but then LG Up wrote an unkown device ... I thought it was flash with lg bridge ... that's what I lost. .. has removed recovery and has stopped updating at 16% ... since then it is only download mode I tried to update but failed with all three programs ... LG up to start - unkown device, LG bridge stop at 16% , LG Falsh Tool 9% ... sorry for my english

Download mode doesnt work.

Hi guys, im having a big problem over here.I have European d855 g3, 32gb version.When i turn it on phone freezes on lg logo and restarts.I thought it is a soft brick so i tried everything to flash it to stock and fix it with all flash tools , and i had a errror like "MODEL INFORMATION CHECK FAIL"" that is with LG flash tool ,When i try to get into download mode phone stays there a while and just restarts, stock recovery is stuck on logo too.So i thought it was battery and i bought new one.Problem is still here.Then i tried on my friends battery too.Nothing helps. I think it is not a hard brick because it is still giving signals of life. Sorry for my bad English, but i desperately need help! :crying: :crying:

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