With the Speedport W 921V router firmware Telekom customers keep the system software of their DSL modems on the current state of affairs. Regular updates of the system software are already recommended only for closing any security gaps. In the download section you will find a TXT file next to the current Speedport W 921V router firmware. In this, the respective changes of the update are listed. As the Speedport W 921V router is installed firmware on the DSL modem, explains one also to be found there PDF manual.