Hi SOGOKU,
Not sure I fully understand, but can you access the BIOS at the moment? If you can, then try EZ Flash to update. If not, try to clear the CMOS for starters. Also, have you tried using the BIOS flashback port? Format your USB stick as MBR/Fat32 and make sure that the BIOS file has been renamed correctly.
It might also be that your BIOS file is corrupt. Try downloading it again.
Z690 Hero, BIOS 3401, MEI 2406.5.5.0, ME Firmware 16.1.30.2361, 7000X Case, RM1000x PSU, i9 12900K, ASUS TUF OC 3090TI, 2 x 16GB Corsair RAM @ 5200MHz, Windows 11 Pro 23H2, Corsair H150i Elite AIO, 4x Corsair RGB fans, 3x M.2 NVME drives, 2x SATA SSDs, 2x SATA HDs.