Hi rafik24,
This isn't going to help your situation - being an internal bluetooth, but...
on 810 alpha the best way to get an external usb dongle to work is to plug it in after autodetection has finished.
Then if the dongle is happy in that port it will be detected as a phone interface.
I found if I left the dongle plugged in I could not connect, or it was very difficult to get it to connect to a wiimote.
Cheers.