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Corrupt UEFI video option rom?

G1 800 Mini
Microsoft Windows 10 (64-bit)

Running windows update for the latest Windows 10 update and it crashed, trying to reboot (full power down and unplug) just brought back a partial copy of the screen it was on (from where?!?).

Clearing the CMOS allows it to boot but re-enabling the Option ROM Launch Policy for Video to "UEFI only" causes the issue again - it won't boot. It looks like the UEFI option rom for video has been corrupted. I have tried clearing the CMOS then flashing the BIOS with the latest version but once that option is set the problem persists. Is there a way to flash to UEFI option roms?

(I need to load the UEFI Video option rom for CLOVER boot manager to work)

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