The is a DOCSIS 3.0 cable modem (often used by ISPs like Comcast, Spectrum, or regional providers). It is not a router —it is a standalone modem with no built-in Wi-Fi.
If you suspect a firmware issue (random reboots, slow sync, no internet), call your ISP. They manage all updates for the Sagemcom CS 50001. sagemcom cs 50001 firmware