Yes. Some are on S2. This could only have happened when I downloaded the desktop app. How I can I set them back to S1?
Ah I see - yes you can go back to S1, you need a mobile S1 Sonos controller device (iOS or Android) - don’t use a device that runs iOS 14.2 as that Apple version has a few issues, best to use an earlier, or later version of iOS, or any recent compatible Android mobile device. The mobile needs the S1 App only - if S2 is installed then remove that newer App.
- Make a note which devices are S1/S2 and then Power off all your Sonos speakers.
- Wire just one S1 only (non upgraded device) to your router and power it up.
- Open the S1 App and you should see just your wired S1 Sonos product in the App. Ensure your services and playlists are present, before moving to the next step.
- Do this step one at a time ...Factory reset/Power On your S2 upgraded products, so their status light is flashing green and using the S1 App goto "settings/system/add product” and follow the instructions to add the device to the S1 system - it should downgrade to S1.
- Repeat for the other previously upgraded Sonos devices.
- If all is well, then power on your other S1 devices.
You can then put the devices back to where they were and hopefully all will be fine.