Thanks for posting these steps, but I am getting hung up on your instruction:

-Type "amdvbflash.exe -unlockrom 0" in CMD screen and press ENTER button.

I've meticulously followed your instructions, but here I am getting the error:

"'amdvbflash.exe' is not recognized as an internal or external command, operable program or batch file."
 
I find this file nowhere on my computer, even though I have installed the AMD RX 5700 XT Windows 10 x64 Driver. What can I do to get "amdvbflash.exe" as a recognized file?