Hi, I would like to install a new modem that I have purchased and return the one I have leased from Comcast. The modem I bought is an Arris SurfBoard DOCSIS 3.0 cable modem which the manufacturer lists as compatible with Xfinity, but it doesn't go when everything is connected. It seems that Comcast needs to activate it. I would appreciate your assistance. Thanks
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Connect it to the coax line and power it up. Let it fully sync up with the system ("DS, "US", and the "Online" lights are steadily lit). Connect a computer to it and open up a browser. You *may* see their "Walled Garden" modem self registration page. If so, follow the screen prompts. Have your mobile telephone number, your Xfinity username and password or the account number and telephone number associated with your Comcast account handy.
If not, try calling 1-855-652-3446. That is their device activation line.
If that doesn't work for you, you can call 1-800-comcast and tell a rep that you would like to have a new modem provisioned for service. Have the RF / CM / HFC MAC address and the serial number of it handy when you call.
My pleasure !