Probable solution to VS990 motherboard with H900 or H901 software (marshmello hole)

[Mouldydroid]

Hi guyzz I think I've found a solution to the following problems:
1. VS990 board with H900 or H901 software.
2. Settings app crashes, Fingerprint sensor doesn't work, uninstalling an app causes soft boot

But I need help. So anyone willing please comment below.
P.S. as usual this is an experimental solution, so please try at your own risk.

Step 1: I need someone to put their phone in [Qualcomm HS-USB QDLoader 9008], because to my understanding this is the lowest level hardware control for the emmc in qualcomm evices.
Step 2: Once in this mode we need to follow the qfil solution to recover from the hardbrick and install the VS990 software.

But as I'm new to this, I've only found one way of entering the mode. (can't add the image due to xda restrictions -_- please help me with posting the image link )
If there is a software way to do this too, please comment below.

 

[lukskajwoker]

I have the same problem.
I tried many solutions but nothing better.
What is your solution ?

 

[Mouldydroid]

I have the same problem.
I tried many solutions but nothing better.
What is your solution ?

Hi, sorry for the late reply. But my solution is very very risky. It involves willingly hard bricking your phone and just flashing the device with VS990 software using the Q-fil method. But I need testers to actually prove that it works in general and not just on my phone.

But as I mentioned it is very very dangerous. So, unless you have the phone just lying around; I wouldn't suggest it.

 

[lukskajwoker]

OK,
I would try. Now phone is usless.

 

[ardian1899]

Hi, sorry for the late reply. But my solution is very very risky. It involves willingly hard bricking your phone and just flashing the device with VS990 software using the Q-fil method. But I need testers to actually prove that it works in general and not just on my phone.

But as I mentioned it is very very dangerous. So, unless you have the phone just lying around; I wouldn't suggest it.

Ok, what is it?
I'm more than willing to try.

I also have to mention that the ARB is not just in the system, it's also somehow modifying the hardware. I have 2 H900 (both are VS990) boards. One of them is 5.1 rooted, the other is H90021w. I put the 5.1's emmc on the other board and not working. Then I flash the H90021w on the former 5.1's emmc, the phone is working. I won't put the H90021w emmc to the other board as it will ruin the board.

Note: I have a medusa pro box, so I can flash the 90021w anytime if it's bricking.

 

[ardian1899]

Hi, sorry for the late reply. But my solution is very very risky. It involves willingly hard bricking your phone and just flashing the device with VS990 software using the Q-fil method. But I need testers to actually prove that it works in general and not just on my phone.

But as I mentioned it is very very dangerous. So, unless you have the phone just lying around; I wouldn't suggest it.

I think some of us are ready.

 

[xzlo]

I am ready to do this, translate in 9008 if still relevant,
skype:zlocontrol
lg v10 h900&901

 

[Theamerix]

Hey, I'm really interested on how this turns out.

So from what I'm understanding, the idea is to get the LG V10 AT&T software flashed (with verizon motherboard) into usb qloader mode, and then to flash the verizon software or the original LG V10 H900 unto it?

I'd say its worth a go, but I don't have a medusa box in case it goes wrong ^^

 

[ardian1899]

Hey, I'm really interested on how this turns out.

So from what I'm understanding, the idea is to get the LG V10 AT&T software flashed (with verizon motherboard) into usb qloader mode, and then to flash the verizon software or the original LG V10 H900 unto it?

I'd say its worth a go, but I don't have a medusa box in case it goes wrong ^^

I've try the very possible way I can think of.
I've take out the EMMC and put a H900 lollipop inside it, not working. Not even any other FW will working, whether VS990 or H901, not after we put H90021w on it. And if I put that EMMC with android 5.1 on another VS990 board, which H90021w is never run on it, it's working fine.
I really suspect the ARB of H90021w is making physical changes on the board, and then only H90021w will working and probably newer FW too. I think that's our only chance. If we can find someone with newer FW willing to help, we can try it. Please check https://forum.xda-developers.com/att-lg-v10/general/calling-help-h90021z-h90022b-firmware-t3881691

 

[Mouldydroid]

Hi and thanks for the support. But due to utter desperation I got rid of the phone about 3 months ago. Now here is all of my research.
1. Get into HS USB mode by holding down both vol up+down....
2. Get QFIL to flash and it should work... P.S. flash proper ones... also dont flash versions below the one that it got messed up with

P.S. I did have a guy try out the board pinching method to get into HS USB... and somehow he got into fastboot and then I got out of contact with him

 

[ardian1899]

Hi and thanks for the support. But due to utter desperation I got rid of the phone about 3 months ago. Now here is all of my research.
1. Get into HS USB mode by holding down both vol up+down....
2. Get QFIL to flash and it should work... P.S. flash proper ones... also dont flash versions below the one that it got messed up with

P.S. I did have a guy try out the board pinching method to get into HS USB... and somehow he got into fastboot and then I got out of contact with him

Thanks..
But the problem is, there's no newer KDZ than H90021w around.

 

[Mouldydroid]

Thanks..
But the problem is, there's no newer KDZ than H90021w around.

I know.... but my solution was... as you get into EDL mode all security goes to hell (theoretically) so theoretically you should be able top flash the original ROM that was meant for that specific motherboard, and not the one that was eventually installed during refurbish process

Now technically this should get rid of the unable to uninstall apps and the fingerprint bug....

 

[ardian1899]

I know.... but my solution was... as you get into EDL mode all security goes to hell (theoretically) so theoretically you should be able top flash the original ROM that was meant for that specific motherboard, and not the one that was eventually installed during refurbish process

Now technically this should get rid of the unable to uninstall apps and the fingerprint bug....

Maybe.. but the option is very limited on H900. And if we flash the H90021w firmware, there;s no way back.
Basically I really suggest anybody outside US to avoid buying an AT&T phones.

 

[ardian1899]

I need to add. Contrary to many believe here, motherboard with VS990 code may not only for verizon, but Tmo and AT&T as well. I've open many V10's board, not once I found H901 or H900 printed on the motherboard (many VS990 and a few F600). Even those H901 which working normally and able to run on the latest official nougat KDZ, are on VS990 boards too.

 

[Feldmarschall Edgar]

I need to add. Contrary to many believe here, motherboard with VS990 code may not only for verizon, but Tmo and AT&T as well. I've open many V10's board, not once I found H901 or H900 printed on the motherboard (many VS990 and a few F600). Even those H901 which working normally and able to run on the latest official nougat KDZ, are on VS990 boards too.

Is there a way to identify for what deviceversion the version of VS990 board one might have really is.