Helps unscramble EFI firmware version confusion, and gives details of the macOS 10.14.1 update properly. Recommended for all users.
firmware
Apple doesn’t provide an official list of the current EFI firmware versions which should be installed on each […]
If you have updated to macOS Mojave 10.14.1, or applied the latest Security Update for High Sierra (2018-002) […]
I have now had a chance to analyse the EFI firmware updates included in the macOS 10.14 Mojave […]
Adds details of the sequence of screens displayed at each stage, to help diagnose boot problems.
You want to boot your Mac from an external drive, but it doesn’t work. A diagram to explain what can go wrong, and how to fix it.
The command bless used to be able to control all things to do with booting, but has become steadily less useful with the advent of SIP and others.
Single-diagram summary of how a modern Mac starts up in macOS 10.12 or 10.13, from pressing the Power button to running the kernel.
Important info about resetting the NVRAM with a firmware password, and new procedures for resetting the SMC in Macs with T2 chips.
What boot.efi does to prepare to load and run the kernel: building the hardware device tree, handling startup key commands, and more.
The Eclectic Light Company 