Comment 22 for bug 1441095

Now I can make the device work by changing the retry timer from 1s to 4s in mbim_device_command():
http://cgit.freedesktop.org/libmbim/libmbim/tree/src/libmbim-glib/mbim-device.c#n1234

After changing that, the device can operate normally.
So looks like it may be a driver/firmware/hardware problem.