If the PIN code or pairing password error message keeps popping up after connection, you can enter "0000" or "1234". If the error still occurs, the Bluetooth data on the device is abnormal. Delete the previous connection records on the device. Put both earphones into a charging case with sufficient power. Press and hold the charging case button for 10 seconds until the orange light flashes 3 times and the white light flashes slowly. Use the device to search for the Xiaomi OpenWear Stereo for pairing.