What do you mean legacy devices vs UEFI devices? Any device added to a UEFI boot menu can be a UEFI device. UEFI does not classify boot devices as legacy or not. Typically you have to add boot devices to a UEFI menu either through BIOS which can insert the alternate boot device into the UEFI boot order or through the UEFI interface directly. I suspect it is the former on pc class machine.
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