With the new 80.06.04 update (8-06-24) Downgrade Product to S1 is functional again. I just did it! Had an S1 Connect:Amp fail (fast white flash LED) and it's the rear channels of an S1 Playbar and Sub. Had an S2 Connect:Amp at work, but during this software fiasco, couldn't downgrade it until today...
System Settings --> (scroll to bottom) Help Center --> Downgrade Product to S1