Many of this model have been unable to update to newer firmware versions. An appeal for users to report their firmware version and logic board ID.
EFI
Essential facts about the firmware in your Mac, how it’s updated, and which version you should be running. With links to more detailed articles.
If you’re working towards this benchmark (or those for earlier versions of macOS), or want to maintain systems to its requirements, I have something to help you.
What is wrong with this iMac, which has such a struggle updating its firmware? And why is Apple not acknowledging the problem?
What do you know about the hidden and unmounted EFI partition on all the disks you use with your Mac? It could be very important.
The macOS 10.15.4 Supplemental Update released on 8 April 2020 isn’t a small update by any means, at […]
Apple has released macOS 10.15.4 Supplemental Update, an out-of-cycle update which fixes: problems taking part in FaceTime calls […]
A couple of important issues to be aware of when using SilentKnight or LockRattler.
Have you checked whether your Mac is running the latest version of firmware? For some iMacs, that might bring an unwelcome surprise.
Many users of iMac 17,1 models – described officially as the iMac Retina 5K 27-inch Late 2015 – […]
The Eclectic Light Company 