Why do Macs with T2 chips show a black screen when starting up or updating their firmware, and why so long that it’s scary?
firmware
Updates now distinguish between firmware versions for High Sierra and Mojave, and those for Catalina. Recommended for all users.
Suggestions which may stop your Mac from panicking or having other problems when a second or external display is connected to a USB-C/Thunderbolt port. And an intro to caffeinate.
There are three software systems at the heart of every Mac: its firmware (‘EFI firmware’), the system kernel, […]
Catalina upgrade may fail to update EFI firmware correctly in some Mac models, notable iMac17,1. Check your firmware!
How reporting EFI firmware versions in SilentKnight will change in the near future, depending on updates.
For the moment, firmware versions for updated Macs are different between those running Catalina, and those running Mojave earlier. How could this affect Sierra, though?
macOS 10.15 Catalina brings EFI firmware updates for all supported models, and subsequent updates have changed those for […]
If you’ve been running pre-release firmware on your Mac’s T2 chip, trying to revert to a release version could brick it.
Apple started the 10.14.6 update on 22 July, and has (perhaps?) completed it on 26 August, almost as bad as with High Sierra last year. Does this bode ill for Catalina?
The Eclectic Light Company 