Error in app for newly installed radiator thermostat

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I have just installed 2 thermostats, one comes up with error on the app. It shows as connected with good battery in the app. I have restarted it 3 times by removing the battery.

On the thermostat display it shows a spanner, a home picture and a temperature reading. It is at firmware 66.4, the other one that I installed without issue is at firmware 95.1


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