How to read and interpret firmware version numbers from the first Intel Macs to the latest Apple silicon models.
EFI
Details of new firmware versions for iMac 2019 models, those with T2 or Apple silicon chips. And how Apple assigns version numbers to iBoot.
Ten years ago, a firmware worm that could have inserted malware into Mac boot flash storage was demonstrated, and shortly afterwards many Macs were found to be running outdated firmware. We’ve come a long way since.
Listing for all compatible Intel Macs with T2 chips, and all Apple silicon Macs.
Gives the latest firmware versions for all Macs running the most recent supported version of macOS, and which are expected to change in the future.
A round-up of firmware updates across 15.4, 14.7.5 and 13.7.5, prospects for future macOS and firmware updates, and problems updating to 15.4.
Did you spot the change that didn’t take place as expected in the 15.2 update this week? It marks the end of the Intel era for Macs.
From the Macintosh ROM of Classic days, to Open Firmware in Power Macs, and on to (U)EFI with Intel, and ending up with LLB and iBoot in Apple silicon Macs.
How Intel Macs without a T2 chip boot, and how Secure Boot works in those with T2 or Apple silicon chips. How the latter can still enjoy Secure Boot when starting up from an external disk.
Latest macOS updates bring revised firmware for most models. Here are details of which are no longer being updated, and what’s likely in the future.
The Eclectic Light Company 