[T-Mobile LG V10 Q&A, Help & Troubleshooting] airitech:
Is there a reason this thread has been ignored? I also have a LG V10 H901 21J MM/6.0 stock firmware.

I have not as of yet flashed a .tot file to it, because I am not sure that the .tot files for other H901 phones is correct. I have heard different things, regarding this particular version, which I have heard is a Korean version of the phone, I am not sure if this is applicable or true, but apparently this may mean the phone has a different board than other H901s out there.

What I can say for certain is that I was unable to unlock my bootloader, due to the inability to reach Fastboot/Bootloader moder from this phone using any of the normal methods which work on my other LG V10 901. The procedures I have followed to get into Fastboot/Booloader mode are: (a) Shutting down phone; --> Pressing Power-Off, and Volume Down at the same time, holding for 5-6 seconds after the LG screen appears, which just causes the phone to boot normally, (b) running <adb reboot bootloader>, which again just boots normally, it does not go into the bootloader/fastboot mode; and (c) Power down /turn off the phone, once off, hold down Volume Down, while you plugin a USB cable into the phone(that is already plugged into a computer with good drivers on the phone), continuing to hold down the Volume Down until you reach Fastboot, again same results and this does assume that the USB cable is plugged into a computer with good drivers.. Just for the record for the methods listed that involve having the phone attached to the computer, I have tried this with the phones USB in both Multi-Media Mode, and PTP mode, without a difference being made, and it should be mentioned that I have successfully performed all 3 methods on my LG V10 H901 20L running stock MM, which was successfully rooted using the Dirtycow exploit. Yes, debugging is enabled on the phone, and although it does not effect getting into Fastboot mode itself, OEM UNLOCK is enabled.

If I could get into Fastboot on this phone, and get it unlocked, then I should be able to use the Dirtycow exploit in order to get temporary root, that would of course allow me to then flash TWRP recovery directly to the recovery partition, and solve the issue.

rabahallia I know that this is almost a year late, but can you tell me if your phone was unlocked when you flashed the .tot file, and if so, how did you go about unlocking it? Also, I can tell you based on the chipset that the phone runs, that you should be able to image a microSD card using a ROM designed for the phone, and then boot using the flashed sdcard image. If you are not able to do that, then can you tell me if now that your phone is bricked, is the phone turning on at all, or just not booting fully? Can you attempt to get it into Fastboot mode now, using the methods I described above? You will have the highest chance of success using the 3rd method in terms of being straight forward, and of course the fact that your phone is not booting :) again that involves: plugging a USB cable into your PC, then, shutting down your phone which is not a problem in your case :) with your phone off, hold down the Volume Down button on your phone, while still holding down the Volume Down plug the USB cable into your phone, and continue holding Volume Down until your phone reaches the fastboot/bootloader menu. If you are able to do this, and you DID NOT unlock your phone before you flashed the .tot with the modified recovery onto your phone, then unlocking the bootloader at this point may allow your phone to boot. To do this, after you have reached Fastboot/Booloader, you will use the command <fastboot oem unlock> wait for it to finish, and it should inform you that your phone is now unlocked, then you can reboot your phone using <fastboot reboot>. Please let me know if this worked, or if you still have the phone, if you could try this. I am interested to know if flashing the .tot to a phone that can not be unlocked due to inability to reach the bootloader/Fastboot mode, as you may have done, would allow that mode to be reached after bricking the phone, and if so, if unlocking the phones bootloader after the fact, fixes the issue. If this does not fix the issue, but you were able to reach fastboot/bootloader, then you should be able to reboot back into Fastboot mode, and then flash a recovery, which would in turn allow you to flash a new ROM to the phone. If anyone else out there has any information SPECIFICALLY ON THE 21J version of H901 stock MM, please provide any information you may have. Or if you have any information about what board is running on this phone, if it is not the same board running on every other version of the H901 such as the 20J, 20e, 20L.