Summary

• Format a USB disk to Fat 32
• Download the BIOS file to USB disk
• Extract the file
• Run the BIOS renamer and it will change the name of BIOS file
• Copy the file with changed name to root of USB
• Reboot and enter BIOS
• Enter EZ Flash update, find the USB disk and select the BIOS file
• It will read it and give bitlocker warning and after that you can update
• Once updated it will reboot with new BIOS
• Updated to 812 BIOS on 2023-04-20

References

PRIME Z790-P WIFI｜Motherboards｜ASUS USA
[Motherboard] How to use USB BIOS FlashBack™? | Official Support | ASUS Global
Fix USB BIOS Flash Not Working | ASUS, ASROCK, GIGABYTE, MSI, etc. - YouTube