Now that Sierra is unsupported, this update no longer marks its older firmware versions as being errors.
firmware
The second Security Update for macOS Mojave 10.14.6 (2019-002) was a hefty download considering how few fixes it […]
What they are, how they’ve changed, how to work out what went wrong, and how to deal with them. No Mac should ever experience a single panic.
Diagnostic, Recovery, Safe, Startup Manager, Verbose, reset SMC/NVRAM, firmware restore, Target Disk/Display, Single-User (SUM) in outline.
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?
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.
The Eclectic Light Company 