@Maj - Sorry for the delay!!
Please follow this guide, starting at step #6, I’ve done #1-5 for you and info is below
[GUIDE] Grub Fix Intel FPT Error 280 or 368 - BIOS Lock Asus/Other Mod BIOS Flash
Rename .efi file to >> Shell.efi
BIOS Lock variable to disable >> 0xBBD
At grub prompt, you will type the following and hit enter (case sensitive)
setup_var 0xBBD 0x00
Then reboot to windows, make sure you deleted biosreg.bin created at FPT step #1 previously (or use new name now, such as biosregnew.bin), and redo step #1-2 and #2 should pass.
Once you pass #2, send me the new #1 file