Eurocom M3 - Manual (Page 163)

Modules
Bluetooth & WLAN Combo Module 7 - 27
7
Bluetooth & WLAN Combo Module
If your purchase option includes the
Combination Wireless LAN & Bluetooth
module (either Intel® or 3rd Party) then install the driver as instructed overleaf.
Make sure that the module is on (i.e. the system is not in
Airplane Mode) before in-
stalling the driver.

Bluetooth Data Transfer
Note that the transfer of data between the computer and a Bluetooth enabled device is supported
in one direction only (simultaneous data transfer is not supported). Therefore if you are copying
a file from your computer to a Bluetooth enabled device, you will not be able to copy a file from
the Bluetooth enabled device to your computer until the file transfer process from the computer
has been completed.