Help Please Help Unbrick after Failed Downgrade

[Android Goodwin]

I have an LG G Stylo (ms631) that i bricked trying to downgrade from android 6.0 back to 5.1. Last thing i did was use LG Flash tool on my PC to flash the 5.1 kdz, not sure what i did wrong. The device now will not boot at all. Ive rooted, flashed roms, customized the stock rom, etc many times before without any problems, just my first time downgrading. Noob question but is there anything i can do besides replacing the logicboard??

**NOTE: The kdz should still be valid (used before to fix boot loops, & once before to flash from katana rom to stock), & after the flash tool finished the device shut down and refuses to boot up

 

[Android Goodwin]

Gonna try connecting Device to a different PC to rule out possibility of corrupted file or malware. Ill update with results....

 

[viperdink]

Try changing to "CSE" Flash in lg tools.

 

[Android Goodwin]

PC (running windows 10 ) does recognize Device as "Unknown USB Device (Device Descriptor Request Failed)". But LG Flash Tool wont connect to Device. LG United Mobile Driver v4.1.1 installed. LG Flash Tool 2014 v1.0.0.1 installed.

Device not responding to hardware buttons nor gaining heat (nor responding to cable pluggined in without battery).

 

[Android Goodwin]

UPDATE!
**After 'removing device' in Control Panel > View Devices
With or without the battery: PC recognizes Device as "Qualcomm HS-USB QDLoader 9008 (COM8)"

But Lg Flash Tool still won't connect.

Investigating further, Device reports "Device status : ...Code 43".

 

[viperdink]

androidcreations.weebly.com/lg-g-stylo-update.html

Try gt's tool version of tools .
Set clear smartphone info

It should tell you the last installed firmware version you installed if it had good rom flash.
If you need a known working kdz pm me ill share it with you.

Update;

Im checking this out

www.androidbrick.com/unbrick-all-qualcomm-snapdragons-from-qualcomm-hs-usb-qdloader-9008-if-you-have-the-right-kind-of-rom-qhsusb_dload

 

[Android Goodwin]

I updated lg drivers & adb, Device now connects to my laptop as "Qualcomm HS-USB QDLoader 9008" (sometimes has COM4, COM7, COM8 in Device Manage, depending on which usb port its using).

Cant find any solutions to unbricking QDLoader 9008 that work for LG

 

[Rootster]

I updated lg drivers & adb, Device now connects to my laptop as "Qualcomm HS-USB QDLoader 9008" (sometimes has COM4, COM7, COM8 in Device Manage, depending on which usb port its using).

Cant find any solutions to unbricking QDLoader 9008 that work for LG

I just got mine back from LG repair for same reason. Think had something to do with partitions being changed in earlier OTA update (10j). Whichever, I bricked mine into QDLoader as well trying to go from 20g to 20c on LG UP. Fortunately, LG fixed mine free, and I noticed have since pulled access to the kdz's online now. Nobody would supply the Qualcomm flash files needed so couldn't use the QPST tools.

Rooted again using ADB method, TWRP installed, Xposed with LGmod and Layers Manager. I have managed to mod the phone almost completely (with exception of a couple LG apps like Music, Gallery, and DownloadsUI). Using combination of layer apps and xposed LG mod, plus Nova Launcher Pro. You will spend a month playing with the different combos of colors, transparencies, and formatting options.

 

[Rootster]

 

[Android Goodwin]

I bought mine second hand off Facebook, and becasue it was rooted do you think lg would repair it for me?

 

[Android Goodwin]

Or could i restore a TWRP image in an android emulator? (With the image being of the rooted device) could i then extract or compile file(s) needed to flash fix the Device?

 

[NC200X]

Long time lurker, first time poster.

I've just had this issue happen to me today when I also attempted to downgrade from the MS63120g firmware LG installed from a repair job to 5.1.1. I am pretty familiar with rooting and flashing ZIPs and KDZ files with my prior phone, an LG Optimus F6. However, my current situation is a bit different; whenever I plug in my Stylo without its battery or back cover, my laptop reads the phone as "Qualcomm HS-USB QDLoader 9008 (COM10)". Plugging in the phone with its battery inserted for a brief moment is read as the unknown USB device, as stated earlier.

I have read into a couple of tutorials of how to unbrick from this state, but apparently, the method doesn't work with LG's G series. I'm thinking I might as well bite the bullet and buy a replacement if this is the case.