Six years ago, iBridge came for Macs with T2 chips, then 3 years ago Apple silicon models got iBoot instead of EFI. Now EFI support is dwindling fast.
EFI
No updates for Intel Macs without T2 chips, apart from the iMac19,1, and there only in Sonoma. T2 and Apple silicon models are more confusing, though.
This article lists the firmware versions of Macs that have been successfully upgraded to run macOS 14.8.2 Sonoma. […]
Is your Mac likely to receive firmware updates in future? How can you check whether its firmware is up to date? What happens in Sonoma?
Some Intel Macs without T2 chips have firmware updates with last week’s security updates. Here are the details.
On Intel Macs, key combinations determine startup modes and more, but they have no effect on Apple silicon Macs. And how to deal with keyboard problems when logging in.
Why your Mac’s firmware version may not be the latest you expect. What you can do about that, depending on its type.
List of current versions of firmware for all models of Mac supported by Ventura, following upgrading to Ventura.
In less than 5 years, Macs have gone from unsecured firmware and booting to a fully secure process to deliver, install and run firmware which can’t be exploited.
Since replacing Open Firmware in 2006, EFI firmware has undergone major change. Now only installed as part of a macOS install or update, here’s its story.
The Eclectic Light Company 