Installed Mojave, and worked fine at first. Did a restart and now I can't get past the following message.
It boots,. WiFi setting screen appears, then when I try proceed it says:
A critical software update is required for your Mac, but an error was encountered while installing this update.
Your Mac can't be used until this update is installed
[Shut down] [try again]
But it never passes that point.
Any thoughts?
I can't reinstall high Sierra either.