The factory reset button restores your device to the default settings, including network and audio configurations. 

Please use one of the following solutions:

1.  Press and hold VOL -, VOL +, and Source buttons on the device at the same time until the LED light flashes (hold for more than 5 seconds)

Or alternatively;

2. Open your JBL ONE App.
3. Navigate to the support tile.
4. Select RESTORE FACTORY SETTINGS.