Thank you, Serg008, you are the best! InstantFlash failed with "Secure Flash Check Fail" error, but "Bios Flashback" button installed the bios successfully (there is description on how to use it in the manual) and activated
Fixed, https://forums.mydigitallife.net/threads/award-ami-bios-mod-requests.5863/page-3074#post-1442863