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Re:Mac OS High Sierra automatically checks EFI firmware each... by gruez on Sunday September 24, 2017 @09:24PM (#15327459)
>Yeah, it seems like this would have to be accomplished with a Management Engine application or something of the sort, otherwise probably easy to circumvent.

The correct solution to this is secureboot. No need for ME shenanigans.

Re:Mac OS High Sierra automatically checks EFI firmware each... by microcolonel on Sunday September 24, 2017 @09:35PM (#15327505)
If secureboot is functioning, then the wrong firmware wouldn't be installed to begin with by the time OS X gets to it, because it would not be allowed to run.