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by magicpointer 968 days ago
Also with the M1 Pro MacBook, my LG USB-C monitor broke during the upgrade. Black screen, same on another connected USB-C laptop. Tried different cables, unplugging power from the monitor and factory reset on the monitor, no luck. Other inputs like HDMI and DisplayPort still work. I don't think the breakage during the upgrade is a coincidence.

I would really advise against having anything connected to the Macbook during upgrades, except the charger...