Comcast sent me a new Gateway this week because they said there was an security isue with my old one (CISCO DPC3941T). The new one is the same make and model. I installed and everything seems fine except that BOTH the old and the new Gateways show up under Devices.
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It's not a concern if you are not having problems. The prior device should drop off eventually. You can call 1-800-comcast and ask a rep to remove it if it bothers you.