Fired up my test Dell Inspiron 7559 through UEFI boot and it first failed but that was my fault. I forgot to undo all the changes to the ltsp.conf I had done on Friday. After I changed the boot files all back to ipxe.efi the Dell 7559 booted just fine to the FOG menu and also successfully registered with the FOG server using the quick registration. I guess your assumption was correct about the funky setup of the Parallels UEFI VMs. BIOS works GREAT on those VMs, it’s just the EFI boot that doesn’t get through the bzImage phase.