You can only connect one Frontier X device to the app at a time.
To connect to another device on your app, you will first need to unpair the previous Frontier X. In your app, click on the “Disconnect” button in the top-right corner. If your Frontier X has not been used for some time, it may have disconnected automatically.
Once you have disconnected from the previous device, you can connect with a new Frontier X by selecting Connect.
Follow the directions for how to connect your device to your Fourth Frontier app. When connected to the app, a Frontier X device will blink green.