Can you relatively easily access coin battery on motherboard.
Removing that for a while should then reset UEFI.
My motherboard also has jumper pins next to battery to do a full reset.
But I have a SSD on USB adapter. It boots fine from ESP on hard drive, but I tried to configure to directly boot from UEFI. After several tries system totally locked up. All the suggestions did not work. And then unplugging internal drive with UEFI & replugging it in did work. But that drive has a working bootable system.
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