I don't know about the Optiplex specifically, but in general, the boot device has to have efi boot media in it to be recognized as an uefi device. At least that was true with the aptios bios.
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I don't know about the Optiplex specifically, but in general, the boot device has to have efi boot media in it to be recognized as an uefi device. At least that was true with the aptios bios.