Honeywell ZWave Thermostat Offline Communication Lost

After the latest update, my Honeywell ZWave thermostat is no longer connected. I tried reconnecting it but it doesn’t discover. It asks me to download a controller and I do, but still no dice. Help?!

You probably need to “exclude” it before you can re-add it. In mobile app under, hub, settings, Z-Wave utilities, Z-Wave exclusion.