Comment 2 for bug 693702

Generally, you should use the "option" driver instead of "usb-serial" which "should not be used directly for *anything*" (quote from the Linux USB mailing list).

If usb_modeswitch works properly you should not have to load this driver manually - it should be done by the usb_modeswitch wrapper script. Feel free to file a bug or get involved at the usb_modeswitch home site.

Anyway, to load the driver manually for your modem do:
# modprobe option
# echo "0b3c c005" > /sys/bus/usb-serial/drivers/option1/new_id

Josua Dietze (usb_modeswitch "upstream")