I needed to reset the password on a Cisco router provided by Comcast for Internet service for a local business, since I needed to update firewall rules in the router, but when I tried what I thought was the password it didn't work. The model number for the Cisco router was DPC3941B (the model number is on the bottom of the router). I also needed to reconfigure the subnet used by the router for the Local Area Network (LAN) after resetting the router, since the computers on the LAN were using IP addresses from a 192.168.0.0/24 subnet rather than the 10.1.10.0/24 subnet used as the default one for the router.
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