F7 BIOS for the Aorus Xtreme
Make a FreeDOS USB with included RUFUS. Put BIOS and efiflash.exe onto the USB after making it.
Boot into BIOS. Hit F7 to load BIOS defaults, F10 to save and reboot. As it reboots, hit F12 and boot from the USB NOT UEFI
When it boots into DOS, type