1. Firmware not loading.

   dmesg | grep -i bluetooth bluetooth hci0: Direct firmware load for brcm/BCM20702A1-0b05-17cb.hcd failed with error -2

2. Download Windows driver from ASUS.
   http://dlcdnet.asus.com/pub/ASUS/wireless/USB-BT400/UT_USB_BT400_6516000.zip
3. Extract and open Win32\bcbtums-win7x86-brcm.inf
4. Find Product Name (BT400).

   %AsusBT400.DeviceDesc%=RAMUSB17CB, USB\VID_0B05&PID_17CB ; 20702 standalone

5. Find section …

READ MORE