OK, me alegra que hayas resuelto tu problema.
En el readme.txt están los pasos para desinstalar el modem:
Cita: Uninstallation.
Linux modem driver is started by the boot script 537_boot. The script location
is distribution specific, usually /etc/init.d. So to uninstall the modem, delete
this file, and stop the modules using command: rmmod Intel537
make uninstall does this for redhat.
Saludos.