MK3.1 Controller - The joystick zoom has stopped working!

The firmware may have been updated recently? Please power on the unit by holding down PWR... keep it held!! The screen should say the version.. it is firmware MK3.1/S or MK3.1/Z ? Your firmware should be /Z version, for the zoom knob! If your firmware is correct, then go to... MENU / INPUTS / AXIS ..... And set ZOOM axis to ... JOY-Y