I had four Play 1's on an S2 system, and recently acquired two Play 5's, which I had on a separate S1 system. Everything worked fine until I tried to Reset the Play 1's and add to the S1 system. Not sure, but I may have missed a step before deleting the S2 app. I have one Play 1 connected to router via network cable (I'm adding them one at a time) while the S1 system searches for it to add. S1 finds the Play 1, but the only options I get are "Review your options" and "About downgrading to S1". I view both "Review" and "About", but then see no option to continue. Solutions appreciated!