Eurocom D90xC PHANTOM-X - Manual (Page 121)

Modules
Bluetooth Module 7 - 15
7
8. Do not use the close button or Fn + F12 key combination before clicking File >
Exit or the correct status will not be displayed.
9. You can then use the Fn + F12 key combination to turn off the Bluetooth module
(check the LED icon for the Bluetooth module power status).
Figure 7 - 11
Bluetooth
Disconnected