Hi ​@Bopat, welcome to the Sonos Community! 

I’m sorry to hear that you’re having issues with your system after performing the update. I’ve had a look at your system and can see everything is online besides your Play:3 speakers, is this the case or are you seeing other speakers still missing from the app?

If you’re missing speakers, then I’d first recommend getting them back before trying to add your Play:3s back. I’d recommend rebooting your router, Sonos speakers, and controller (device running the Sonos app) by powering them off for one to two minutes. 

When your speakers are showing in the app, you’ll want to follow the downgrade process for both the Play:3s as this will also take you through the setup processes since you’re not sure if the downgrade worked. It’s worth temporarily wiring the Play:3 you’re trying to add to your router to help with the process, you can always move it back when you’re done with the setup. 

If this doesn’t hep and you still can’t add your speakers back to your S1 system, then I’d recommend contacting our support team for further support, as they have the tools available to help you troubleshoot and get all your system back on S1 and working.

I hope this helps!