1.How to do when the device is malfunctioning, like fail to boot, no sound when playing?
A: Here is a video FAQ to introduce resetting Q3:
Try to reset the Q3, or use another charger or data cable to charge it.
【Fail to turn on after a long-time of inactivity】
It is recommended to charge the Q3 with a low current charger, such as a computer or 5V/0.5A one.
Long press the GAIN button for 15 seconds until the RGB light (at the volume knob) goes out for 0.5s. The reset is completed.