Cannot pair/watch cannot be searched
First, check whether the watch battery has any power left and press the watch button to check whether the screen can be lit up. If not, charge the watch before you try to connect it with the mobile phone.
If the watch battery is full, keep the watch as close as possible to the mobile phone before you retry the connection.
If the connection still fails after you perform the above operations, try to turn the mobile phone Bluetooth on and off once or restart the mobile phone.