What to do if the one of the Xiaomi OpenWear Stereo is mute or not connected?

To check the connection issue, please refer to the following contents:
Put the earphones into the charging case and press and hold the charging case button for 10 seconds until the orange light flashes 3 times. And then the white light flashes slowly. Restart the phone and then connect again to see if there is any sound. If there is still no sound, connect to another phone to inspect. If the problem still exists, please apply for after-sales inspection.