The new USB Option WWAN modem devices support a CDROM device, which holds the needed Windows driver to use the WWAN modem. . Therefore the firmware of the WWAN modem announces during the USB enumeration process to work as a virtual CDROM device with its vendor name "ZOPTION". . This device is now called ZERO-CD. . ozerocdoff is a solution to switch off the ZERO-CD and allow the modem to be a used as a modem.
