Can't search when Binding watch?

1. Whether the watch has been turned on and is in the QR code interface. If not, please reset the watch and then scan the code for binding
2. Is Bluetooth on
3. Whether the location permission, network permission and Bluetooth permission of black plus app have been opened according to the guidance
4. 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 bind again
5. Please check whether it is connected by other mobile phones