Chromecast users recently experienced problems with the second generation Chromecast dongles and the Audio devices not functioning properly. The issue was linked to an expired security certificate stopping the devices from connecting or being set up again, especially if you performed a factory reset.
Google initially advised against factory resetting the devices. But as is customary, their users will always defy them because they’re not always right. In this case, they were. You’ll be unable to set up affected devices again afterward.
Updates for Chromecast dongle and Audio issue now rolling out
Google eventually rolled out a fix for the affected Chromecast 2nd Gen and Chromecast Audio devices. If you had done the factory reset they warned against, you would need to update the Google Home app to allow re-setup.
The intended update for the app carries the version numbers 3.30.1.6 for Android and 3.30.106 for iOS. It might take
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