Hello,
I have an older Mac (mid-2011) and just attempted a controller update and this is second consecutive update where things have not gone right. The update did not complete and I got a fail message flash and then it said update done but system was not found. This happened last update as well and I powered off computer, cycled power on router and cycled power on the Sonos Boost. I have a wireless connection from Mac and no Sonos speakers connected to router. I keep cycling router but cant get controller on Mac to recognize system. App is working fine on iPhone. Any help or advice is appreciated. Would like to have clean updates is future again.