[Q] LG G2 stuck in security error bootloop - G2 Q&A, Help & Troubleshooting

It started out where i could only boot into fast boot and NOTHING else, but I found this tutorial where i would erase and replace all the image files and put the g2 in a sort of testing mode. So i did it and when i booted it up....it had the LG logo and the lg logo with a security error....This kept on going for a while until i did a factory hard reset and now it just does it once and then turns off. The only other thing i can seem to boot into is download mode because when i try the tot method it has this error saying CrossDL [D802] to [D800]. And so i try another method which required a kzd file, there are kzd files for everything but the d800, which is what i happened to have. I try for an hour looking for one with no luck. I try the LG mobile support tool but it goes through the first part and just gets stuck on the second part and doesn't even have a loading bar, it just says so not unplug USB. Im really getting frustrated and can find any way to make it work. PLEASE HELP!

Sir,
Please wait until mods will move this thread to the device specific forum.
For reply or more questions please register an account on XDA forums.
Stand by
Good luck

Related

LG G2 (Korean D800/802) Soft Brick Boot Loop

Hi Everyone,
To make long story short, My friend bricked his korean G2... (on plastic says D802, inside written D800),
I tried everything possible in XDA, tried flashing KDZ without success (800 and 802, stopped 99% and still boot loop),
tried flashing TOT (only 802 worked, says Fail to get BOOT, FBOOT FAIL !!, still boot looped, can go to download mode but not to recovery).
Don't know what to do anymore... any advice ?
Thanks,
Naor
Sir,
Please wait until mods will move this thread to the device specific forum.
For reply or more questions please register an account on XDA forums.
Stand by
Good luck

SOLVED: LG G2 D800 (ATT) flash tool fails CrossDL (850) to (800)

Hey Guys,
Hoping someone can help me out here. I've got a friend's LG G2 and I'm trying to help him get it working. When I first got the device, it just booted to a black screen and when plugged into Ubuntu, it would show 15 or so drives that were unable to mount. I followed a guide to fix through Ubuntu and eventually got it to boot to where it would show a black screen with small white text indicating it was in fastboot mode. In fastboot mode, I followed this guide: https://www.youtube.com/watch?v=YEqEE9Qb8Sk and eventually got it to boot showing the LG Screen. I am able to get it into Download Mode and Recovery mode (but performing the hard reset doesn't work, as when the Android Man screen loads up with the progress bar underneath it stays on the screen for about 15 seconds before restarting and staying at the LG logo screen. No matter which Tot file for the D800 I flash through LG Flash Tool, it fails after about 3 seconds stating Cross DL (850) to (800). He had tried to use an G3 Rom on the device, which is what bricked it in the first place. I've noticed that the device is showing a blank IMEI in the flash tool as well. I've also tried using the DLL posted in @hyelton 's guide (LGUP_8974.dll) and it still gives me that same error.
Hoping someone here might have an idea of what I can try next to get this thing working again.
Thanks!
Mark
Fixed
All right guys. After much painstaking searching, I've finally found a solution, thanks to THIS REDDIT THREAD. I used a hex editor to modify the first line mentioning "D800" in the TOT file that is provided along with the link to the YouTube video in my OP, changing it to "D850." I used Hex Editor Neo to do this. This should work with any LG G2 that has had incorrect firmware flashed on it when you are getting an error of CrossDL from the LG Flash Tool.

Lg g2 ls980 bricked (only white lines on screen )while installing recovery by autorec

While trying to install custom recovery through autorec my LG G2 sold as D802 and infact an LS980 got bricked and showing white pixelated lines and black screen.
- No recovery mode
-No download mode shown on screen
- No fastboot mode shown on screen
-Phone shows up as unspecified android device on windows 10 and connected through Marshall London Bootloader Interface
-Phone switches off and on while pressing power key, rest not known
-Flashtool doesn't recognize any device.
-command prompt in fastboot tool can erase data on the phone, but can't flash any img files
I've searched and read various forms and articles through internet. no one has found any proper solution though some people claims that hex code editing or flashing a partition and a tot file through fastboot mode may solve the issue and tried a few of them. No positive sign till now, I'm r trying out the fastboot method right now, But I'm not sure whether my phone is switching into fastboot mode or not
Can some one please guide me to get the partition file (laf.img) for LS980. ??????????
And if someone can share some serious input on this problem, it'll be really useful for a lot of users includng me.
Or even suggest some methods for trying out.
whenever i got stuck with this sort of errors i used to find my way out using reading tutorials and forums on xda. But this time i cant find a way out.
prnv said:
While trying to install custom recovery through autorec my LG G2 sold as D802 and infact an LS980 got bricked and showing white pixelated lines and black screen.
- No recovery mode
-No download mode shown on screen
- No fastboot mode shown on screen
-Phone shows up as unspecified android device on windows 10 and connected through Marshall London Bootloader Interface
-Phone switches off and on while pressing power key, rest not known
-Flashtool doesn't recognize any device.
-command prompt in fastboot tool can erase data on the phone, but can't flash any img files
I've searched and read various forms and articles through internet. no one has found any proper solution though some people claims that hex code editing or flashing a partition and a tot file through fastboot mode may solve the issue and tried a few of them. No positive sign till now, I'm r trying out the fastboot method right now, But I'm not sure whether my phone is switching into fastboot mode or not
Can some one please guide me to get the partition file (laf.img) for LS980. ??????????
And if someone can share some serious input on this problem, it'll be really useful for a lot of users includng me.
Or even suggest some methods for trying out.
whenever i got stuck with this sort of errors i used to find my way out using reading tutorials and forums on xda. But this time i cant find a way out.
Click to expand...
Click to collapse
i would suggest just to be sure before you can do more harm.. to post and ask in the goign back to stock thread.. you will get help there
Same issue
I have the same story with my LG G2 D802 any luck?
I have the same issue... Please give updates on your progress
I have Got The Same Issue.....no COM port so as to flash tot, i cant also flash using flash tools. Somebody Help
Same here, you guys burn your G2?
Looks like I'm a bit late for the party. Well i ended up my lg g2 ls980 (sold as d802) in the same condition. I fixed it by booting into qhsusb_bulk mode by shorting the capacitors and using srktool. Now my phone can boot into download mode!
(Note: this method only works if your phone shows up as qhsusb_bulk and not qdloader or something like that)

My LG F800L doesn't turn ON after H918 kdz installation! HELPPPP

Hello.
First, sorry for my bad english..
I got the F800L model and I rooted the device following the guide of Dirty Santa.
One day I read in forum that someone was able to flash H918 rom to the F800L device.
So I tried to do same.. but with the mistake of not backing up my original rom.
When I tried to flash the H918 rom through TWRP, it installed well, but when it booted, it just remained hanged in LG logo.
I just left it over a day waiting if it pass the LG logo. But it didn't.
Then I searched for the fix and read the guide about restoring the bricked device through LGUP and kdz file.
So I entered in download mode and connected to PC.
Executed LGUP software and my device appeared in H91810i model instead of F800L. I downloaded the F800L kdz file and tried to restore with LGUP but it appeared error saying kdz invalid.
So I managed to download the H918 10i kdz file and tried again to restore.. and WOW! it completed the process.
But.. Now my device is in worse condition. It doesn't even turn on.
Tried to enter again in download mode but nothing happens.. neither enters in fastboot mode...
Pulled out the battery and reinserted, and tried to turn on but nothing happens..
Can anybody help me please???
I think you destroyed your phone
You should get it to repair service
lol, u just facing the same problem with me, i did exactly the same what u do, was looking around for solution, but nothing really helpful out there, the only way i found is the method with sd card, u get the debrick img file, burn it to a 32gb sd card with the right tool, put sd card to your phone and hope it will get to downloadmode or fastboot or whatever idknow cause i'm don't have the debrick.img file for F800L, looking for it right now, people say u can get that file from the phone (has same model) that still working, that all i know for now, if u found anyway to fix your phone please told me :highfive:
It has been repeated over and over and over "DO NOT FLASH ANYTHING THAT IS NOT MEANT FOR YOUR DEVICE" and also "FLASH AT YOUR OWN RISK". Both of them together makes it pretty clear that you shouldn't have flashed something that was meant only for the h918 into an f800l variant. Developers dont write this down as fancy words or for fun. They do it in order to let everybody know that if flashed, it could easily alter your system in such a way that it might never be fixed except by the company itself. By flashing something that wasnt meant for your device, you are trying to override the system with an image. And if the developer never made the source compatible with yours, then software and hardware will be contradicting each other. The motherboards of the phones comes for its specific variants and only developers can alter an image of a system to make it somewhat compatible with the variant.
Now, lets hope you get an answer to how to fix it because LG wont be fixing it for you since you voided your warranty by a) the simple fact of unlocking the bootloader (which is pretty easy to identify since it shows the warning sign when you turn the phone on), and b) you rooted the device. And LG wont work with neither of those. Unless.... and this is a maybe because i dont know if they would agree too (if you pay the sum they request to fix it, which i assure you it will be more that $100+ maybe even significantly more). Then they fix it for you.
I personally made a backup in a separated MIcro SD card i have outside the phone. So that if i have problems with my system, then i just insert that micro sd card and restore the backup.
Good luck!
If the phones screen is blank when you try to turn it on you bricked. Only fix is a replacement. There is NO debrick.img
oh my god, if u stop at the step KDZ tool found your device that H918, I can help you. Just boot to fastboot mode and fastboot the file name bootbackup.img and KDZ tool will found your device is F800L then KDZ normally. Sorry for my bad English.
gamza88 said:
Hello.
First, sorry for my bad english..
I got the F800L model and I rooted the device following the guide of Dirty Santa.
One day I read in forum that someone was able to flash H918 rom to the F800L device.
So I tried to do same.. but with the mistake of not backing up my original rom.
When I tried to flash the H918 rom through TWRP, it installed well, but when it booted, it just remained hanged in LG logo.
I just left it over a day waiting if it pass the LG logo. But it didn't.
Then I searched for the fix and read the guide about restoring the bricked device through LGUP and kdz file.
So I entered in download mode and connected to PC.
Executed LGUP software and my device appeared in H91810i model instead of F800L. I downloaded the F800L kdz file and tried to restore with LGUP but it appeared error saying kdz invalid.
So I managed to download the H918 10i kdz file and tried again to restore.. and WOW! it completed the process.
But.. Now my device is in worse condition. It doesn't even turn on.
Tried to enter again in download mode but nothing happens.. neither enters in fastboot mode...
Pulled out the battery and reinserted, and tried to turn on but nothing happens..
Can anybody help me please???
Click to expand...
Click to collapse
hi did you find any way to help ? i m in similar position
me2151 said:
If the phones screen is blank when you try to turn it on you bricked. Only fix is a replacement. There is NO debrick.img
Click to expand...
Click to collapse
Hello My Friend,
I have F800s and I rooted by your methos and did exactly the same thing as OP installed H918 rom through twrp. Now I can only go in download mode and LGUP reads my phone as H918 what should I do please help .

Hardbricked LG L Fino! Nothing works!

Hello,
Recently i was given a LG L Fino to try to bring back to life. Something that i was not very successful up to now.
When the device is turned on it only loads up to the LG logo loading screen and freezes there. The hard resent back buttons combination and the download mode are non operational as well. In particular the download mode shows error:
Secure booting Error!
Cause : boot certification verify
meaning that flashing the stock .kdz image wont be possible.
I had revised some of the possible hardbrick fixes available in the forum but non of them worked as well. Trying to scan and flash the .tot files, with BoardDiag, was also not possible as the phone was not properly recognized by my machine and i did not manage to find the exact com port. I had tried a few but with no success.
If you have any suggestions i would be very happy and thankful to hear and try them.
Thank you!

Categories

Resources