Yes, we may need to find AFU method for your system. I can fix the 280 FPRR (Flash Protected Range Register error), but that's another modified BIOS you need to flash in, or program etc, so it needs to be on your board before it can be disabled, so that wont help.
Here, try this method and version of AFU. Download the tool package here, ignore the rest of the guide, just follow last spoiler/method to reflash.
https://linustechtips.com/main/topic/592...herboards/
If that does not work, I can send you large package of different AFU/AFUWin/AFUDOS to try.
You might need to purchase CH341A flash programmer + SOIC8 test clip cable.
However, we can try this also first, before using FPT agin or resorting to the above AFU stuff
https://www.win-raid.com/t3908f16-GUIDE-...-BIOS.html
Alt boot to grub when no boot to EFI on exit page -
https://www.win-raid.com/t3144f16-Help-n...l#msg58324
Start at step #6, because I will give you variable from 1-5 below,
Your BIOS lock variable to unlock >>
0xAE
Rename .efi file to >>
Shellx64.efi
So at grub prompt you will type following >> setup_var 0xAE 0x0
If that fails, you can try running these PRR/PRR2 to remove the protection, these need to be ran from DOS (And the above needs done still also, before this, otherwise you will get error 368)
http://s000.tinyupload.com/index.php?fil...6690359132
For this, put all files in FPT DOS folder onto root of your USB bootable DOS stick, both prr/prr2 on root, and a copy of the mod BIOS.
Run prr, if it fails/does not give you success message, run prr2 >>
Then if success run FPT to flash mod BIOS using >> FPT.exe -bios -f filename.bin (Rename bios to whatever you want .bin, use that file name here)