How to restore factory Settings?

Solutions:
1. After the headset restored factory setting, the new device or the previously paired device shall be reconnected if necessary.
2. If presses the button of the charging box for a long time, the indicator light of the charging box continues to flash, and the process of flashing -> long bright -> flicker -> extinction. It is suggested to reset after charging for a period of time.
3. If the reset is still not successful, please try to switch the open cover state and press the long button to reset.