Sometimes known as iBoot1 and iBoot2, they start work with the LocalPolicy for the intended boot volume, validating its vital components.
firmware
Understanding each of the four stages in the Secure Booting of an M1 Mac. These are summarised in diagram available here.
There’s a fundamental difference in the way that Intel and M1 Macs store and load their ‘firmware’, which enables the M1 Mac to load and run difference versions of iBoot.
This article has now been extensively corrected and modified.
For those who want macOS updates promptly, SilentKnight can be a help. But don’t use it to download and install an update.
Improved reporting of firmware, Gatekeeper, and clearer documentation are the main improvements.
If you haven’t yet installed any of the updates and upgrades released by Apple on 25 October 2021, […]
This article lists the firmware versions of Macs which have been successfully updated to run macOS 12.7.6. Apple […]
Installing two different versions of macOS within a single container brings flexibility as they share free space, a little economy maybe, and complexity – explained here.
Apple has just released the 11.5 update to macOS Big Sur. It’s of modest size, weighing in at […]
The Eclectic Light Company 