To Change to HID mode Hold down FireOheat and push the Probe switch to TEST.
Please note, this may not appear in Game Controllers, but this will work perfectly fine for any game and will require mapping to be done in most games.
If using FalconBMS it has a limitation of 32 buttons, I suggest you checkout Joystick Gremlin for splitting the unit into Virtual Controllers to overcome this.
If you wish to adjust the Brightness of the backlighting in HID mode, this can be achieved by Holding FireOheat and turning the YAW TRIM Knob.
If you wish to use DCSBIOS mode, Hold down the FIREOHEAT Button and push the Probe Switch to HEAT.