Hard Brick after 20j to 20e revert- Don't do it! - T-Mobile LG V10 Q&A, Help & Troubleshooting

UPDATE: Read this!
TLDR: Don't flash 20j update and try to revert....== HARD BRICK
Long version:
The new 20j update has the Anti-Rollback feature tag set that you can NOT revert back to 20e.......You will HARD BRICK your V10 if you do so. I have...and a few others have.
I was on Eliminater74 20e rom, which is excellent. But he released a P1 .zip for the new 20j update. This contains new bootloader etc. (no P2 which is the actual rom for 20j yet.)
This will boot on 20e, but users (myself included) noticed video issues with YouTube and soon after, others reporting that video recording is broken now.
Naturally, we thought to revert and flash back to the 20e bootloader P1. zip.......and that caused HARD BRICK. Phone gets stuck in Qualcomm Emergency Bootloader mode that is not recoverable.
FIX: Contact " tungkick" http://forum.xda-developers.com/member.php?u=4965298
He helped me un-brick phone. No data was lost! Was quite easy actually. ( I don't see his methods or files he used released here on XDA publicly) (if it is i'm blind.) So don't ask me...contact "" tungkick" .
See post here for instructions: http://forum.xda-developers.com/tmobile-lg-v10/development/debrick-phone-h901-qualcomm-9008-t3440359

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I did the same thing, flash tool isnt picking up phone either, I think we are hard bricked at this point...

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speedingcheetah said:
I flashed V10_H901_V20J_Stock_BootStock_Part1_20160810.zip ...that booted fine. But then I used pheon for a while and noticed YouTube was having issues of videos freezing but audio playin...a few others posted they had the same thing.
So I booted to TWRP and flashed the olde rP1 .zip for the orginal bootstock and hit reboot system and no...Nothing!
Black screen. No vibrate when I try vol down + power. When i try Vol up and connect usb to my computer...It shows "Qualcomm HS-USB QDLoader 9008 (COM8). LG Up says it cant find anything.
Usb device descriptor failed in Device manager when I do vol down and plug in.
I have no idea what do? Help? I have been searching a few forums, but not really sure what is happening.
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Click to collapse
I was just about to start a new thread asking if I could flash back to previous marshmallow. Anti rollback may be in effect. If you have all the correct drivers installed it sounds to me like a hard brick. Hopefully I'm wrong and someone can help you

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headcreepz said:
I was just about to start a new thread asking if I could flash back to previous marshmallow. Anti rollback may be in effect. If you have all the correct drivers installed it sounds to me like a hard brick. Hopefully I'm wrong and someone can help you
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And....I assume a hard brick is very bad...not easy to fix? I messed up my G3 once, but at least it would show some sign of life.
I am not at all experienced with adb or fastboot..and how to get all that to work...I have tried, but with no success. Don't suppose there is someone I can send my phone to have it unbricked?

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Same predicament here
Sent from my SM-T337T using XDA-Developers mobile app

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Oh guys.... I am pretty sure that I've read around here and there that when you get that Qualcomm message you're not recoverable. I surely hope I'm wrong!
Sent from my pretty nifty brand new LG V10

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Yea....it sucks. I have literally been up all night trying every method I can to recover from the Qualcomm Emergency Bootloader mode I'm stuck in. There are some LG programing tools that seem to be fake/scam by some user...but those were for the G3 and G4 anyway. Nothing I tried worked.
Just bought the V10 2 months ago used off swappa, already rooted, twrp etc..about $300. Just got the thing all setup the way I wanted it too...sigh. THis is what I get for not being patient and seeing what others experience before flashing something so new.
I was slightly aware of an "Anti-rollback" thing,,,but had no idea it would apply to same and inter-version version of OS. I still don't get why flashing the 20j bootstack on top of the current 20e rom would have caused the video freezing of youtube issue. Standard troubleshooting measures dictated to flash back to the 20e Bootstack to see if the issue went away(I have flashed back and forth bootstack etc on my G3 before with no issues).
Whelp......I guess myself and the other user (SIGMAxB) the 2 confirmed hard bricks served as the community warning........and my very first hard brick and loss of a device in such a fashion. THankfully, I was able to find last night another used V10 on Swappa that is already root and TWRP...for slightly less money that what I paid for my now bricked device. Least I had made an LG backup last week, and all my data is on the External SD card...but still gonna be annoying to have to start over......
Any mad scientist or master flasher who knows how to recover such a bricked device... I would be interested in sending it to them to fix....(I doubt T Mobile will give me a new one, nor wil LG Service the device. It's still under LG warranty, but their site requires u upload a copy of the receipt, and their terms state only covers original owner. So used phone off Swappa.....does not qualify. )

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Dropped off my phone at a place called CPR (Cell Phone Repair). Thier location near me is more advanced than most others in that they can do data recovery and software kind of things. They said they may be able to fix phone, but he isn't very sure. Said there will be some techs in tomorrow that are more advanced that may be bale to help. I personally don't have much hope, but worth a shot at this point.
Until then...using my Moto X Pure for now...while I wait for the replacement V10 i bought off Swappa to arrive.

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That really bites man.....I'm sorry.

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I'm a prepay customer....they have different policies for us vs post paid customers.
I called 611 and got transferred around a bit. But finally got them to process a warranty exchange. I have to ship them the phone and they will send me a new one....hopefully. They didn't mention anything about a charge.
So at least I have that option to pursue should CPR place fail to reflash phone.

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speedingcheetah said:
I flashed V10_H901_V20J_Stock_BootStock_Part1_20160810.zip ...that booted fine. But then I used pheon for a while and noticed YouTube was having issues of videos freezing but audio playin...a few others posted they had the same thing.
So I booted to TWRP and flashed the olde rP1 .zip for the orginal bootstock and hit reboot system and no...Nothing!
Black screen. No vibrate when I try vol down + power. When i try Vol up and connect usb to my computer...It shows "Qualcomm HS-USB QDLoader 9008 (COM8). LG Up says it cant find anything.
Usb device descriptor failed in Device manager when I do vol down and plug in.
I have no idea what do? Help? I have been searching a few forums, but not really sure what is happening.
Click to expand...
Click to collapse
I did the same thing. It really sucks because I been doing this for over 5 years and this is my first brick. I guess thats what we get for having faith in a developer that should of known or properly tested this before putting a rom out.

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supreme329 said:
I did the same thing. It really sucks because I been doing this for over 5 years and this is my first brick. I guess thats what we get for having faith in a developer that should of known or properly tested this before putting a rom out.
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While I agree that things should be tested...or otherwise noted that it has or hasn't been so.... (OP does have Status: Testing posted)
It wasn't the rom, his 20e rom runs great. But the updated P1 20j(bootloader)zip....it was the act of reverting and flashing the previous Bootloader version that caused the Hard Brick.
Until this point, I (and many others here) had not seen anything about the Anti-Rollback feature being an issue while on the same Android OS version (LP or MM builds). Now we know it is.
Additionally, the other posts on Eliminater74, rom forum....are indeed users reporting issues with the 20j zip...(mainly Video recording and YouTube streaming). However, the phone is not bricked.
Unfortunately, it's on us folks who flashed it right after it was released and then tried to revert who got screwed. It is definitely a good idea to wait a few days after something is posted to be sure others, mainly early adopters, don't report issues. If your phone is mission critical and you can not be without it or risk having a issue, then modding is not what you should be doing. Or at the very least, once you do get something flashed and stable.....stick with it (that voice in the back of my head was telling me this when i decided to try the update).
I am not sure as to how Eliminater74, had tested the P1 20j bootstack flashed to his 20e rom....but yes,,,,it does suck that this happened...but I am kicking myself in the head...not the dev. At least mine and the 2 others gave him waring and he was able to post a big red warning on the OP. Though I would suggest he remove the 20j part.....but that is up to him.
Least i had a backup phone to make use of until i can get a new V10...very annoying to have do so...but its something.
PS: I am actually starting to like my Moto X Pure more. Dual front facing speakers really nice. ON stock rom now, but used Bliss or while....that's is very nice and super tweakable. Screen isnt has sharp as the v10....and camera is just super basic. I also miss tap to unlock and the other LG specific features...but stock android is growing on me. The BT toggle has a dropdown to select devices to connect to right there, very convenient.

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I'm definitely buying LG phones
this latest LG phone
wised

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If someone is being Qualcomm 9008 brick please contact tungkick to unbrick Done

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PjLyTam said:
If someone is being Qualcomm 9008 brick please contact tungkick to unbrick Done
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Click to collapse
left my phone with a place called CPR, Cell Phone Repair. I doubt they will be able to do anything with it. But once i get it back...probably tomorrow if they don't get back to me. I will see about that. Although, I did get t-mobile to approve an exchange, but i have to ship them my phone back first.
Just got a replacement V10 used off of Swappa. It already has Eliminator rom on it, though not sure what build. Attempting to restore my backup file to it.

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debrick done ^^

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So... tungkick is awesome! Phone unbricked.. without data wipe
BUt stuck on 20j now...
BUT....now i have a 2nd v10.....lol!.

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tungkick said:
debrick done ^^
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I assume there is a reason you haven't released this method and files publicly on XDA right?
I also am assuming you don't want me or others spreading this to others.
If i am wrong, please let me know.

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speedingcheetah said:
I assume there is a reason you haven't released this method and files publicly on XDA right?
I also am assuming you don't want me or others spreading this to others.
If i am wrong, please let me know.
Click to expand...
Click to collapse
no it new because i get phone brick customer of vietnam yesterday then find solution unbrick it.
---------- Post added at 07:17 AM ---------- Previous post was at 06:49 AM ----------
http://forum.xda-developers.com/tmobile-lg-v10/development/debrick-phone-h901-qualcomm-9008-t3440359

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tungkick said:
debrick done ^^
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Click to collapse
Hello
Hard Brick H901
I applied right here commands
http://lgviet.com/forum/threads/huo%CC%81ng-da%CC%83n-unbrick-v10-h901-qualcomm-9008.59550/
phone is opened from sd card
but it does not switch to download mode
When switching to download mode puts reset
the picture looks