Arm SystemReady and the UEFI Firmware Ecosystem.However, if you are running one of the 16 Mac models identified by Duo Labs, there is a chance that your system hasn't received any EFI update at all: iMac 7,1 to 10,1, MacBook 5,1 and 5,2, MacBook Air 2. Apple released EFI updates separately, but since 2015 the EFI update is bundled in the software update Apple has been pushing out to users.
