The process of downloading the LiteOn (T)SF-1156v( )/R21 driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the LiteOn (T)SF-1156v( )/R21 driver from the primary server - this is the manufacturer’s OTHER MODEM DRIVERS official website). If the download still fails to run, check whether your anti-virus software is not blocking the connection to the manufacturer server of the LiteOn (T)SF-1156v( )/R21 diver.