not sure if this works, you can have a try:
-
download the USB driver of Windows:
https://source.sierrawireless.com/resources/airprime/software/sdx55-windows-drivers-latest-release/#sthash.t4StrCJv.dpbs -
create a configuration.ini file in the same folder as the driver, add the following setting in configuration.ini
[Default Values]
USBCOMP=9
-
run the driver exe.
-
connect the EM9 to windows again