Post https://forums.mydigitallife.net/threads/award-ami-bios-mod-requests.5863/page-2922#post-1355655 updated
You must use older versions of the efiflash utility (included to the pack) to skip the BIOS signing check.
Post https://forums.mydigitallife.net/threads/award-ami-bios-mod-requests.5863/page-2942#post-1368739 updated