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Reply to Critical software update required, but an error was encountered... Stuck
I have the same issue with my mbp (A1707). My touch bar is off, keys backlight too, problems with authorization of iCloud. I have two assumptions for now according to findings across the internet: it has something to do with the broken channel of power supply of touch bar and T1 chip, maybe some capacitors are dead it has something to do with the T1 firmware update, maybe during os update it was removed, and somehow not replaced What I have tried so far: Restart SCM, Reinstall OS-X from the internet, Run Apple Diagnostics -> all hardware is fine (what?!?) Current workaround: The first-time login in safe-mode (start mbp holding left shift till login), disable wi-fi or switch off ethernet plug, restart mbp in normal mode. Shutdown/Restart always with a disabled internet. I hope somebody from Apple will shed light on this topic and give some explanations on the T1 firmware update and how to recover it or check that it's broken or why Apple (hardware) Diagnostics thinks that's everything fine if my eyes see it is not?? #iDontKnow
Jul ’21