Cable modem firmware deployment is strictly regulated by Internet Service Providers (ISPs) like Comcast Xfinity, Spectrum, and Cox.

When checking the modem log via 192.168.100.1 , you might see "Ranging Request Retries Exhausted" or T3/T4 time-outs. While these look like software bugs, they are usually firmware reactions to physical line noise.

Motorola MB8611 DOCSIS 3.1 Multi-Gig Cable Modem - Amazon.com

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.