Hi friend, there are two way to downgrade :
1. try to modify the platform.ini settings (change to 0 Don't check rom file version)
[Bios_Version_Check]
Flag=1
CheckByBios=0
CheckByBiosErrorMessage="This BIOS file is not allow to flash. The flash process will be terminated."
;This flag is the switch of checking BIOS version.
;Flag default : 2.
; 0 : Don't check rom file version.
; 1 : Check BIOS version.
; When rom file version is older then BIOS, it will display
; a warning message and close application.
; 2 : Depend on BIOS report.
2. Using Intel FPT and flashing a prior version, then adjust it flashing original to align the ME section.
Let me know
Regards
P.S. use this tool run it as Admin and ipload the result file here :
https://www.mediafire.com/file/4s2lp3ig8...0h.7z/file