[LG V20 Guides, News, & Discussion] jeanclaudevandamme:
Right, I've figured out where things have went wrong but still can't find a fix

1) So after Step 14 after running the BAT files all cmd windows closed. I then clicked step3.bat while in fastboot mode. because he did not explain clearly where you were supposed to get CMD window for commands in Step 16.

I had used CMD / ADB / Fastboot years ago, but I had forgotten how they worked exactly, as the instructions for the previous phones I have rooted were so much better written.

later i discovered how to see what was inside a BAT file (use notepad to open it) so step3.BAT contained instructions to flash "boot1.img" which came with the Dirty Santa v20 files. I don't know what model that boot image was taken from. it also contained instructions to flash a twrp file name that didn't exist (so I guess nothing would have gotten flashed).

2) later I was able to launch into fastboot mode and manually flash the correct twrp file onto the phone. then led me being able to get into twrp recovery to flash kernel + SU.

However phone still didn't boot, presumably of the mistake was previously by clicking Step3.BAT, which flashed a "boot1.img" from dirty santa files

Also when going into download mode, the phone would crash with static 1 second after connection.

3) At the time, I didn't know the difference between aboot and boot files. So I went into fastboot and flashed abootbackup.img

I still don't know fully what aboot does. But the effect it has is it locked the bootloader, so i am no longer able to flash anything with fastboot. writing the old aboot.img has caused my device to go into a corrupt bootloop, cannot launch into recovery.

I think that if I flashed bootbackup.img then things might have worked out ok. i had 2 choices and I picked the wrong one, but that's gone now.

flashing the abootbackup.img also had another effect, download mode no longer crashed with static after 1 second, however a new error code came up when download mode is launched <633A B50>, the phone acts like a firmware is currently trying to be flashed but stuck at 0% even just by launching download mode.

I'm guessing there may be some sort of variant mismatch between the boot1.img and the abootbackup.img as the boot1.img wouldn't have originally come from my phone? As well as the other stuff pushed onto device in Step2.BAT

eithe way, LG Bridge / LGUP do not recognise model even with Uppercut.. LG Flash 2014 has the error messge of "connection to server failed", I tried letting it run in the background without closing error message as suggested in that thread, but I guess because of my 633A B50 error message, flashing did not occur in the background like other people.

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I don't know where to go from here exactly. because

1) boot1.img, that came with dirtysanta files, which model / variant did it come from?

2) what LGUP_common.dll will recognise my device now? I know someone patched their DLL, but how do you patch a DLL using hex editor and how to make the DLL recognise my presumably mismatched device?

3) i don't know what the <633A B50> error message means exactly

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https://xdaforums.com/v20/help/help-h990ds-t3650303

looks like someone did something similar to what I did. he didn't get answers to his questions and he hasn't been logged in since August..