Yesterday I proceeded to update my Sonos system to the latest update as prompted in the Controller App (iOS 12.1+) and after the update, it said something to the extent of it not fully completing and to retry, so I did, which didn't fix it. I proceeded to plug it directly in to an ethernet port and tried again, with no success. I tried re-pairing it, and rebooting it, etc. with no luck. I then turned off all other components and re-installed the controller app, factory reset the Connect and then tried to set it up as a new system by itself. It finds the unit and appears to start setting up, but eventually just goes to the solid amber light. I've tried these processes multiple times, plugged and unplugged, wired/wireless, etc. But the end result ends with the unit not being detected in the app and the solid amber light. I'm bummed to think that this update bricked my Connect.
Best answer by AjTrek1
Best course of action is to submit a diagnostic and post the reference ID in this forum. Afterwards call Sonos Tech support so that they can work with you in real time.
How to Submit a Diagnostic: