The Gen 1 Play:5 isn’t compatible with S2 app.
You might, at least potentially, be advised to unplug your gen 1 PLAY:5 when updating. Then you should be able to ‘upgrade’ the rest to S2. Once you’re done with that, you’ll have two systems, one running under S1 with the PLAY:5 that you’ve plugged back in, and one using the S2 controller, with your other speakers.
They won’t be able to ‘see’ each other, of course.
Thanks all for responses, however I have removed the play5, reset it and up plugged but still telling me that my system is incompatible…so I’m a bit lost as what to do….
Then I’d call Sonos Support directly to discuss it .
When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.
Many thanks. Will give them a call tomorrow. 