1. Make sure the display on the watch is ON when attempting to bind with App.
2. The watch can't be searched and bound when the battery dies. Therefore, you may check whether the watch has any power left. If not, you may charge it before you retry the search and binding.
3. Switch off and then turn on the mobile device Bluetooth.
4. Restart the mobile device.
Notes: If the previously bound mobile device is within the Bluetooth range of the watch, the mobile device will preferentially establish a connection with the previously bound watch.