How do I update the Wi-Fi settings on my Smart Thermostat?
Open the Alexa app, go to Devices > Thermostat, select your Amazon Smart Thermostat from the list, then select Settings > Thermostat configuration > Wi-Fi and follow the on-screen instructions. You can also access this through Devices > Thermostat and follow the instructions in the app.
From the official Amazon Smart Thermostat manual, page 9
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