My Move would not update.  It’s on the S2 version and out of the blue it quit working.  Per the directions in the app, I tried to downgrade to S1 to apply the update hoping I could then add it back to the S2 version - that also gave me an error that the unit could not be downgraded.  I had given up on the unit assuming it was just not going to update.  THEN, weeks later, when I was checking some security setting in my Orbi app, I saw that the Sonos Move was showing as “blocked.”  After unblocking it, the update worked.  I don’t know how or why it ended up as blocked in the Orbi system.  Anyway, I hope this helps someone else.