LG G3 Cat.6 Bootloop and unknown device in Download Mode - G3 Q&A, Help & Troubleshooting

Hi guys,
Please bear with me as I'm new to this scene.
My LG G3 Cat.6 (F460L) is currently stuck in bootloop, can't enter recovery mode as well but it can go through download mode but my PC won't recognize it (tried different usb cables and tried it on another PC, still no luck). I made an error when I was trying to flash twrp into recovery but accidentally flashed it to boot (I was quite unsure about what I did but I think I flashed a wrong version of twrp for recovery and tried to reflash the right version but accidentally flashed it to boot, if that made sense). I was able to get into the factory wipe screen and after pressing yes it goes right into bootloop again. Was also able to get into another screen with turn on, turn off and cancel options but I'm not sure what it does because it's all in korean. My PC can't recognize my device right before this happened so I think that explains why it also can't recognize it while in download mode. I saw something about Qualcomm stuff but I'm unsure as to how it is done (the shortpin part) and i don't think my PC would even recognize it as it can't even recognize my device in the first place (faulty micro usb port I guess). Any fix that you guys can think of? Thank you very much!

Related

Hard Bricked D850PR

So the story goes as this:
ATT G3 accidentally flashed a D851 rom... phone rebooted now its a hard brick
I have tried every method to restore it to stock (lg flashtool 2014 and old flash tool method, tried enter TWRP nothing happened)
My phone is detected as it were in Download mode, but it doesnt let me flash anything.
I downloaded the "generic" LGUP8794.dll and tried to flash stock D850 and stock D851, jeez I even tried to flash LS990 stock rom... same error every time.
Downloaded stock D850PR20A_01.kdz and tried to flash it through Flashtool 2014 and just getting error...
I'm really out of options now.
I dont have warranty so its out of question the "return my phone" thing.
Thanks in advance for any reply or suggestion.
PD: I get no "QHUSB" or "fastboot" mode either.
Try using a different usb port. LG flash tool hates USB 3.0 so use USB 2.0
speedyjay said:
Try using a different usb port. LG flash tool hates USB 3.0 so use USB 2.0
Click to expand...
Click to collapse
I have tried with 3 different computers, one with XP, Win7 and win8.1
I never use USB3.0 unless its with a memory stick
Can you go into download mode??
Sent from my SM-N910F using XDA Free mobile app
No, No Download mode, but my phone is connected as it were in download mode.
My screen is good, I know cuz when i connect the usb without battery it lights up and shows an image of "missing batt"
No TWRP either
Any update on this? I just rooted my D850PR and then used AutoREC to install TWRP, then I turned it off to reboot but it never booted...it also lights up the display when connecting the USB cable without the battery but that's all it does
gretschpr said:
Any update on this? I just rooted my D850PR and then used AutoREC to install TWRP, then I turned it off to reboot but it never booted...it also lights up the display when connecting the USB cable without the battery but that's all it does
Click to expand...
Click to collapse
Dos your computer recognize the phone as qhsusb_bulk?
Sent from my SM-G925T using Tapatalk
i cant believe there is no clear solution for the LG G3 brick.
There is a solution
I have faced this issue with my LS990. accidentally flashed D855 ROM then bricked. THere is a unbricking method which is very hard and you have to do it with patience.
Try this
http://forum.xda-developers.com/lg-g3/general/unbrick-lg-g3-qhsusbbulk-qualcomm-9008-t3072091
You might want to short 2 pins of G3 motherboard. message me if this method didn't work.
Good luck matehttp://forum.xda-developers.com/lg-g3/general/unbrick-lg-g3-qhsusbbulk-qualcomm-9008-t3072091
I had that problem, flashed d855 rom on a d850pr, and it went into bootloop, but I just went into recovery, flashed a D850 rom and everything worked fine. I did have your problem once, but with a LG Optimus L2, I tried on windows 8 and 7 but the LGflashtool always stop with errors, until I tried on XP, i could restore it. (sorry for the english)
Fixed hard brick LG G3
This post fix my hard brick problem with LG G3 D850PR:
https://forum.xda-developers.com/att-lg-g3/general/downgrade-lg-g3-d850-to-kit-kat-t3437524
The files I used:
https://dl.xda-developers.com/3/5/0/4/2/8/9/LGUP8974.zip?key=FPUbu3eormslai-eelpOBw&ts=1499518278
http://qc2.androidfilehost.com/dl/d...IN_LGD850AT-01-V10d-310-410-JUN-19-2014-0.zip
http://qc1.androidfilehost.com/dl/c...8065/95916177934528569/Setup_LGFlashTool.zip?

Lg g4 bricked/softbricked

hey guys my G4 apparently bootlooped itself for some reason so i factory reset it which didnt help. This lead me to use lgup to flash the same MM that the phone was running from a .kdz file. Now after the flash it just stays on the LG bootimg screen and wasn't booting up. I removed the battery and put it on again and this time the phone shut off. I also have no recovery mode and when i attempt to boot into download mode it just stays at the icon and doesn't go to the firmware update screen so ive been doing some research and it says the bootloader is most likely the problem. My computer also recognizes it as the 'qhsusb_bulk' error but i came across no solution.
Can anyone give me some advice on what to do here...thanks in advance

Am I bricked forever?

So I flashed the latest nightly of Cyanogenmod and my phone rebooted mid flash and I can't boot into recovery or download mode but my computer still recognises the phone when I plug it in. Can I still unbrick it? And how? I have an LG G3 d855
Try it. http://forum.xda-developers.com/lg-g3/development/boot-verification-failed-secure-boot-t3337280
Figured it out
So I figured it out. As long as Windows recognizes the phone as QHSUSB__BULKfound its fixable. This super useful tutorial helps h t t p://open-freax.fr/guide-unbrick-your-lg-g3/

LG G4 brick (available recovery, adb sideload)

Hi guys. I need help. I have LG G4 LS991. The phone was not fully flashed and after a Hard Reset some sections were erased. It doesn't enter in Download mode. Without battery as qdloader 9008. With the battery, the phone tries to on, but freezes and reboots at different stages. But it enters to the recovery and it's possible to connect the phone as adb sideload. ZV6 firmware with root is set on the phone and Update package does not install. Any thoughts on this? There are chances to recover?
Use lg pc suite connect device to pc if it detects ur phone go to mobile device and then restore upgrade errors it will download the firmware so it will take so time follow the process and flash it ...this works 100% for g3 not sure about g4..there is no harm in trying rit hit thanks if it helps...mind if u had famous bootloop issue that is hardware related it wont fix it

HELP ! LG G3 BOOT VERIFICATION FAIL CAUSE mismatch sig len

Hello
so i have a big issue / Problem i think
So i had the ROM Installed called Limitless_Full_UX5.0_v10.3_by_Cassoli
But i had a issue where my phone didnt pick up my sim card or Sd card so i tried to flash back to STOCK
But what happend i think is that i accidentaly removed the cable and interupted the Install
So now im not able to boot the phone
im not able to get in download mode
and im not able to get in recovery
Basically my phone is bricked
My phone is getting recognized by my computer as Qualcom 9300 or something like that so i dont know if thats is a good thing or bad thing
I Have already tried to flash with LG FLASHTOOL & boarddiag please help me !

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