How to perform a hardware reset

Remove the headphones from your audio device’s Bluetooth list.

Make sure your headphones are turned on.

Locate the 3.5 mm input socket on the headphones. The reset button is in the bottom of that socket.

Use a toothpick or a non-metallic pin and carefully push the reset button for two seconds. The headphones will turn off.

Turn the headphones back on, and pair them with your audio device again.