EFI Lock ,Removal,Remote Management Removal, MDM/DEP.After the firmware is successfully applied to your computer, your BootROM Version will be one of the following:
UEFI requires the firmware and operating system loader (or kernel) to be size-matched for example, a 64-bit UEFI firmware. Tip: If the look of rEFInd leaves a bad taste in your mouth, you can download custom themes to make it better reflect the default Apple design. If you don't make a selection, OS X will automatically boot after a 20 second wait time.
