When you connect your MB8611 to a supported ISP, the modem will perform a handshake. The ISP’s DHCP server will check your current firmware version against its approved list. If an update is available, it will be pushed within 24–72 hours.
Unlike a router, where you can download a file and hit "update," cable modems like the MB8611 are strictly controlled by the Internet Service Provider (ISP). motorola mb8611 firmware
