Develop Bugs

[Q] Boot error - HELP

My LG Optimus G is rooted but not unlocked boot loader...
When I tryed to boot it stops at SECURE BOOTING ERROR !!
I realy need this to work ASAP... What can I do to boot the phone??
I have tryed holding power button for some seconds.. But nothing works..
Please help me ??

why you dont read the guides??
http://forum.xda-developers.com/showthread.php?t=2010624

skdubg said:
why you dont read the guides??
http://forum.xda-developers.com/showthread.php?t=2010624
Click to expand...
Click to collapse
I am reading... And now I need to download latest KDZ .... But I only know MODEL but not know serail number for the phone`... Then... How to download KDZ ?

Weeee... My phone is back to life after I just downloaded the KDZ file and flashed it.... Weeeee!!

LG G4 H815 SEA Stuck on LG Logo Screen

So i decided to unlock my h815sea bootloader, every thing went fine. I was able to flash twrp, flash android 6.0 with root and boot into system. I wanted to install xposed, i downloaded v78-sdk23-arm64.zip. I flash the zip and reboot into system. Now i cant go past lg boot screen. Could someone tell me how i can go into twrp? I am able to go into download mode, but LGUP application shows phone as unknown, can I use lg flashtool to flash android 6.0 kdz? OR am i able to flash android 5.1 kdz since i am able to go into download mode. I backed up everything using twrp and have all the files on my desktop.

nvm. I was able to go into recovery and flash genisys rom for xposed framework. For some reason when i try to flash xposed on a stock mm file, phone goes stuck on lg logo.

blackburry said:
nvm. I was able to go into recovery and flash genisys rom for xposed framework. For some reason when i try to flash xposed on a stock mm file, phone goes stuck on lg logo.
Click to expand...
Click to collapse
When did you unlock your bootloader?

I would love to know the answer to that as well.

reiko09 said:
When did you unlock your bootloader?
Click to expand...
Click to collapse
I was able to get the unlock key when lg accidentally enabled bootloader unlocking for SEA variant on their website. Didn't it use the unlock key until yesterday. Loving MM, so smooth.

blackburry said:
I was able to get the unlock key when lg accidentally enabled bootloader unlocking for SEA variant on their website. Didn't it use the unlock key until yesterday. Loving MM, so smooth.
Click to expand...
Click to collapse
There's a guy (shiboby) that is looking for the unlock.bin files to examine to see if he can figure anything out for them. Doubtful anything will come of it, but you may want to send him yours to see if it would help

hyperfriend said:
There's a guy (shiboby) that is looking for the unlock.bin files to examine to see if he can figure anything out for them. Doubtful anything will come of it, but you may want to send him yours to see if it would help
Click to expand...
Click to collapse
As an owner of a locked H815 SEA, I would greatly appreciate him being sent this file haha. Or perhaps post it in this thread: [Bounty] [allready $2400+] Unofficial bootloader unlock

hyperfriend said:
There's a guy (shiboby) that is looking for the unlock.bin files to examine to see if he can figure anything out for them. Doubtful anything will come of it, but you may want to send him yours to see if it would help
Click to expand...
Click to collapse
Done & Done. Posted the zip on bootloader bounty thread.

Cannot boot into bootloader/fastboot

Hello guys I have H815 and I can't proceed with unlocking bootloader cause my phone cannot boot into bootloader/fastboot mode. I'm not newbie, but with this phone everything goes ****ing different than in instruction.
I the instruction there is adb reboot bootloader. Of course my phone is seen in adb mode but after this command it just reboot to system. I tried also key combinations with no luck...
What to do?
My system is android 6

remialfa said:
Hello guys I have H815 and I can't proceed with unlocking bootloader cause my phone cannot boot into bootloader/fastboot mode. I'm not newbie, but with this phone everything goes ****ing different than in instruction.
I the instruction there is adb reboot bootloader. Of course my phone is seen in adb mode but after this command it just reboot to system. I tried also key combinations with no luck...
What to do?
My system is android 6
Click to expand...
Click to collapse
Hi,
I'm the same...
looking for solution I found this on Youtube:
Pratically, you have to press vol up while connect USB on PC....
I haven't the G4 with my today and so I cannot test if this is a valid mode...
If you do this, let me know if you can enter in fastboot mode

auceto63 said:
Hi,
I'm the same...
looking for solution I found this on Youtube:
Pratically, you have to press vol up while connect USB on PC....
I haven't the G4 with my today and so I cannot test if this is a valid mode...
If you do this, let me know if you can enter in fastboot mode
Click to expand...
Click to collapse
I did that and yeah it entered this mode but it's not valid bootloader/fastboot mode. It's some service mode to update firmware. Anyway it's not visible in pc as a normal fastboot and I cannot proceed further with unlocking bootloader...
Edit: it's download mode... So as I said it's not fastboot mode.
Anyone can help?

Seriously nobody? I thought this phone has good community and support...

I'm facing the exact same problem with my H810 on 6.0. Sick of not being able to root atleast.
Seriously hasn't anyone on earth found a way to boot this **** in fastboot? I mean there are a number of tutorials but everything goes different as F*** with this thing. Hope someone will update with good news. :fingers-crossed::fingers-crossed:

charith262 said:
I'm facing the exact same problem with my H810 on 6.0. Sick of not being able to root atleast.
Seriously hasn't anyone on earth found a way to boot this **** in fastboot? I mean there are a number of tutorials but everything goes different as F*** with this thing. Hope someone will update with good news. :fingers-crossed::fingers-crossed:
Click to expand...
Click to collapse
You can check out UsU. That is an unofficial bootloader unlock

ThePiGuy said:
You can check out UsU. That is an unofficial bootloader unlock
Click to expand...
Click to collapse
Thanks yeah I checked but that's for ARB<=2 devices. I forgot to mention earlier this godforsaken thing is ARB3.

I have an H811 (T-Mo) running firmware H81120p, ARB3. Doesn't seem to be much that can be done with it as far as rooting. It also has no stock recovery, only boots to system.

you did follow this official guide right? it unlocked mine after a few angry moments
http://developer.lge.com/resource/mobile/RetrieveBootloader.dev
use minimal ADB https://forum.xda-developers.com/showthread.php?t=2317790
Only way to boot twrp later is to use fastboot with ADB, recovery with buttons doesn't work.
if the device wont boot a rom use adb to get back in recovery.
if you use bank apps, install magisk before installing rom, do not get SU

samadee3 said:
you did follow this official guide right? it unlocked mine after a few angry moments
http://developer.lge.com/resource/mobile/RetrieveBootloader.dev
use minimal ADB https://forum.xda-developers.com/showthread.php?t=2317790
Only way to boot twrp later is to use fastboot with ADB, recovery with buttons doesn't work.
if the device wont boot a rom use adb to get back in recovery.
Click to expand...
Click to collapse
Only problem is that the info linked to above applies to ONE G4 variant only - the H815 international model. The rest of us are SOL. The bootloader on US carrier G4 - AT&T, T-Mo, VzW, etc (most later firmware revisions for G3 as well) models has been nailed down. The only exception is a G4 with ARB <= 2 can be hacked with UsU in order to root it and install a custom recovery.

SofaSpud said:
Only problem is that the info linked to above applies to ONE G4 variant only - the H815 international model. The rest of us are SOL. The bootloader on US carrier G4 - AT&T, T-Mo, VzW, etc (most later firmware revisions for G3 as well) models has been nailed down. The only exception is a G4 with ARB <= 2 can be hacked with UsU in order to root it and install a custom recovery.
Click to expand...
Click to collapse
Tmo is very easy
Go to dev options and enable adb
Then run "adb reboot bootloader"
Once there, run "fastboot oem unlock" and voila, you have an officially unlocked bootloader with no restrictions related to UsU
Please be aware the above will factory reset your device

ThePiGuy said:
Tmo is very easy
Go to dev options and enable adb
Then run "adb reboot bootloader"
Once there, run "fastboot oem unlock" and voila, you have an officially unlocked bootloader with no restrictions related to UsU
Please be aware the above will factory reset your device
Click to expand...
Click to collapse
Do you know anyone who has done it with H81120o or later? I've seen posts for two yrs about doing it that way, but I don't remember reading about it being done on 20o or later.
Sent from my SAMSUNG-SM-G935A using Tapatalk

SofaSpud said:
Do you know anyone who has done it with H81120o or later? I've seen posts for two yrs about doing it that way, but I don't remember reading about it being done on 20o or later.
Click to expand...
Click to collapse
Why v20o
Remember, this has nothing to do with UsU and therefore ARB etc doesn't matter
Edit: ps there are loads of H811 users in my Lineage thread and the other ROMs too

ThePiGuy said:
Why v20o
Remember, this has nothing to do with UsU and therefore ARB etc doesn't matter
Edit: ps there are loads of H811 users in my Lineage thread and the other ROMs too
Click to expand...
Click to collapse
Got it. Guess that it makes sense. ARB prevents rolling back to earlier release than 20o, I'm ok. Will try the BL unlock today then.
Sent from my SAMSUNG-SM-G935A using Tapatalk

I actually managed to get my LG V20 F800L into same situation after messing up my rooting process.
First i was stuck at logo and factory reset did nothing. Bootloader was working then.
Then i downloaded new firmware through "Download Mode", and after that i lost access to bootloader.
I know the phone model is different, but process seems to be very similar for all LG devices.
Trying to troubleshoot that atm, if i'll have results i'll post them here.
P.S. I know original poster long left (probably after throwing phone into a grinder), but maybe for someone with same problem as us in the future the info will be useful.

Florimer said:
I actually managed to get my LG V20 F800L into same situation after messing up my rooting process.
First i was stuck at logo and factory reset did nothing. Bootloader was working then.
Then i downloaded new firmware through "Download Mode", and after that i lost access to bootloader.
I know the phone model is different, but process seems to be very similar for all LG devices.
Trying to troubleshoot that atm, if i'll have results i'll post them here.
P.S. I know original poster long left (probably after throwing phone into a grinder), but maybe for someone with same problem as us in the future the info will be useful.
Click to expand...
Click to collapse
Ok, now i have to reply to my own post, since i believe i understand now something important:
LG phones usually dont have bootloader open to access. Until you use some exploits to do so.
I did not know that at the time of writing that reply.

Florimer said:
Ok, now i have to reply to my own post, since i believe i understand now something important:
LG phones usually dont have bootloader open to access. Until you use some exploits to do so.
I did not know that at the time of writing that reply.
Click to expand...
Click to collapse
Do you have more details about this? I seem to be in a similar situation than you and I'm struggling to make it work.

"Your device (LGH815P) does not support unlocking the bootloader. "

hi,
ive recently got the G4 as a temp phone and i tried to root hi but when i try to unlock in LG site i get the message: "Your device (LGH815P) does not support unlocking the bootloader. "
from what ive read that mean i cant unlock the bootloader but i can switch it to unoffical bootlader- is any one tried it or can help me find a guid for that or any other solution that will be grate.
tnx.

tendoben said:
hi,
ive recently got the G4 as a temp phone and i tried to root hi but when i try to unlock in LG site i get the message: "Your device (LGH815P) does not support unlocking the bootloader. "
from what ive read that mean i cant unlock the bootloader but i can switch it to unoffical bootlader- is any one tried it or can help me find a guid for that or any other solution that will be grate.
tnx.
Click to expand...
Click to collapse
If you have h815x model then ur in luck. follow this guide also make sure your anti rollback value is no greater that v2
You need to burn FWUL 2.6
Once you boot into FWUL connect to WiFi and update SALT . the app can be found in the 'LG' folder. Connect device in download mode start salt, go to advanced and you will see device info with ARB version
I have a H815T with usu unlock and found it easy to be prepared ie making sure I've got all the files needed for flashing on my sdcard
Preferably using the download folder in /sdcard for flashing usu. also having TWRP on my FWUL desktop in a folder ready to flash and making a backup with salt
Read the UsU op at least twice.
I'm currently running lineage os 15.1 on my usu'd h815 and its pretty sweet
Good luck!

exactly follow the steadfasterX guide to unlock the bootloader. I have an H815P and I have done it successfully

jason_l367 said:
If you have h815x model then ur in luck. follow this guide also make sure your anti rollback value is no greater that v2
You need to burn FWUL 2.6
Once you boot into FWUL connect to WiFi and update SALT . the app can be found in the 'LG' folder. Connect device in download mode start salt, go to advanced and you will see device info with ARB version
I have a H815T with usu unlock and found it easy to be prepared ie making sure I've got all the files needed for flashing on my sdcard
Preferably using the download folder in /sdcard for flashing usu. also having TWRP on my FWUL desktop in a folder ready to flash and making a backup with salt
Read the UsU op at least twice.
I'm currently running lineage os 15.1 on my usu'd h815 and its pretty sweet
Good luck!
Click to expand...
Click to collapse
HI
thanks for the replay.
anyway- i didi that actually the same date that i posted here- so thats done with usu (not that compicated actually) but i had one problem:
i tried to flash the lineage os but it wont pass the loding screen (wated for 30 min twice ) so i flashed aoscp insted and ill be glad to use lineage again- so what is the ver. of your OS and for witch model is that?

tendoben said:
HI
thanks for the replay.
anyway- i didi that actually the same date that i posted here- so thats done with usu (not that compicated actually) but i had one problem:
i tried to flash the lineage os but it wont pass the loding screen (wated for 30 min twice ) so i flashed aoscp insted and ill be glad to use lineage again- so what is the ver. of your OS and for witch model is that?
Click to expand...
Click to collapse
8.1 H815
Use the usu version
http://leech.binbash.it:8008

LG-G3 D851 - Can't Root and Can't unlock Bootloader

Dear all,
I'm stuck and I don't know what to do.
I can't root my LG G3 D851 (T-Mobile) phone.
Recovery mode is only deleting the files (Original LG screen).
Purple, oneclickroot, kingroot they all fail cause they can't start in Recovery Mode.
I think that my Bootloader is blocking this, but LGUP doesn't recognize my Phone.
LG Flash no working DLL? I'm stuck and I'm starting to miss ODIN.
Is anyone able to help?
Cause I don't see it anymore

I have a variant of your phone, the LG G3 D858HK, I sort-of had the same issue and also found that KingRoot, Purple, etc failed, but Towelroot worked when I took the phone out Recovery Mode ..... after about the 10th attempt at trying to root using it that is...... Apparently it can take several attempts using the app before you obtain root

Mr-Dutch said:
Dear all,
I'm stuck and I don't know what to do.
I can't root my LG G3 D851 (T-Mobile) phone.
Recovery mode is only deleting the files (Original LG screen).
Purple, oneclickroot, kingroot they all fail cause they can't start in Recovery Mode.
I think that my Bootloader is blocking this, but LGUP doesn't recognize my Phone.
LG Flash no working DLL? I'm stuck and I'm starting to miss ODIN.
Is anyone able to help?
Cause I don't see it anymore
Click to expand...
Click to collapse
You can't unlock the bootloader. You have to downgrade to a lower version of lollipop, root with kingoroot, and run autorec.

iloveoreos said:
You can't unlock the bootloader. You have to downgrade to a lower version of lollipop, root with kingoroot, and run autorec.
Click to expand...
Click to collapse
Sorry for the late reply.
Yeah I found out as well!
Thanks!