The watch is bound, but the app prompts that the connection fails or cannot be connected?

1. Has the app and firmware been updated to the latest version
2. Please try to restart the Bluetooth of the mobile phone, press and hold the side key of the watch for 15s, restart the watch, and then reconnect
3. Is the Bluetooth of the mobile phone system paired with hey + watch? If yes, please cancel the pairing with the watch in the Bluetooth list on the mobile terminal, and then continue to bind and connect with the current mobile phone
4. Has the watch been bound with other mobile phones around you? If yes, please enter the Bluetooth list of other mobile phones, disconnect the pairing with the watch, and then continue to bind and connect with the current mobile phone