I have a ZP100. I was able to control from my iPhone and Android devices using the S1 app. Those devices no longer work and the S1 App doesn't let me "Connect to an existing system". In fact, the buttons that are illustrated in the app do not match those of the ZP100, but I have completed updates in the past that required holding in the correct sequence and I attempted that sequence with no luck. When I Iog into the Sonos site, my device is connected. So I downloaded the Windows app and I am able to connect and play as normal. Up until a few days ago, I was also able to play using the Android device and a week ago the IOS device. Now I am limited to just the windows app. Any suggestions would be appreciated.
Best answer by cpcook99
After much reading and trying I finally was able to get my ZP100 back online, controlled by my IOS and Windows devices.
After numerous attempts, here is what worked for me.
I factory reset the Sonos device, S1 app saw ZP100 but S1 app would still not let me connect.
Logging into my router I continually saw the SONOS device, before and after factory reset. I reserved the address that the Sonos was given so each and every time the same IP would belong to the Sonos. I rebooted the router.
I once again factory reset the Sonos, the S1 app saw the ZP100 and this time the S1 app did allow me to connect. All of my music services were gone but I would take that over not ever being able to connect.
Good luck to you all trying to resolve the issues and hope this may help.