My 2021 16" M1 Pro started up to an exclamation point in a circle this morning. Since I don't have second machine for the restore/revive process, I made an appointment with genius bar at my local Apple Store thru Apple Support's online chat. I've owned various Mac machines throughout last 10+ years and this is the first time the machine is bricked. I updated the machine with 12.1 when the OS came out 2 days ago.......