Did you try the hotkey to flash the backup BIOS to current version, that might save you from all that hassle, if they've enabled it already.
On bootup, with a latest BIOS other than F2, press ALT + F12 where you would normally press DEL to enter BIOS. If it's enabled it should start BIOS recovery, and flash the backup BIOS with the MAIN BIOS.
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