BOOMSTER XL: The illumination of the buttons no longer works.

The LEDs light up only briefly after switching on, and then no longer.

The BOOMSTER XL provides a function for switching the illumination of the control elements on and off.

Please switch the device on by briefly pressing the on/off key (key 6). Then press the on/off button and keep it pressed. The LED and illumination will now be reactivated.