The vast majority of UEFI firmwares, including recent Apple Macs, use x86_64 UEFI firmware. a memory testing or recovery tool), should be a EFI application corresponding to the UEFI firmware bitness/architecture. Under UEFI, every program whether it is an OS loader or a utility (e.g. The latest UEFI specification can be found at. Unless stated explicitly, these instructions are general and some of them may not work or may be different in Apple Macs. This kind of firmware does not fall under any one (U)EFI specification and therefore is not a standard UEFI firmware. Apple's EFI implementation is neither a EFI 1.x version nor UEFI 2.x version but mixes up both.Unless specified as EFI 1.x, EFI and UEFI terms are used interchangeably to denote UEFI 2.x firmware.Later, a group of companies called the UEFI Forum took over its development, which renamed it as Unified EFI starting with version 2.0.UEFI started as Intel's EFI in versions 1.x. Consider using legacy BIOS booting for such systems if you encounter unsolvable issues. Note: Early vendor UEFI implementations may carry more bugs than their BIOS counterparts.
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