Hi I’ve just bought a pre owned play 1 and would like to add it to my system but my system is S1 and the new play seems to have S2 installed I have factory reset the play 1 several times but still cannot connect tried to contact SONOS to ask if the downgrade tool was working in the last software release waited 30 mins then cut off 
I’ve tried to follow the advice online to no avail still cant connect does anyone know the steps to take to get this connected.
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The S2 to S1 downgrade tool is working in the app (provided you have updated the app).
Is this the advice you have tried to follow:
https://support.sonos.com/en-gb/article/downgrade-a-sonos-product-to-s1
Use the latest S2 app to downgrade it to S1. The Sonos support FAQ has instructions.
Similar setup (existing S1 system only), but I am installing a new One SL. After trying the downgrade option from the Visitor Help Center link and having no success, further research revealed that the One SL is the only device with a footnote indicating it will work with S1 if already part of an existing system, but that it cannot be added as a new device to an existing S1 system.
I'm not sure if I missed that caveat when I bought the device from Sonos a few months ago or if it was inadequately highlighted.
Any hope for the One SL in my current setup, or should I move on?
It has not been possible to downgrade a One SL for at least a year, maybe more. So I do not see a return for the downgrade function. You’d either need a One (that can be downgraded) or an SL that has never been upgraded to S2.
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