I’ve been having similar problems with my x80 pro E3E9. The boot menu in the BIOS simply doesn’t have an option to boot from the USB.
All there seems to be is “UEFI: Built-n EFI Shell” along with the boot manager etc…
I’ve tried disabling secure boot but nothing seems to make a difference. Anyone else seen this?
(I’m trying to re-install windows and get rid of android)