I purcahsed an Arris Wi-Fi Cable Modem ( model No. SBG8300), as it said it was compatible with Xfinity. I've attempted to set it up on my xFi app, but when I get to enter the CM MAC address, all I have on the modem is an HFC MAC address. When I enter it in, or even use the camera to scan the bar code, it rejects the address and asks for me to enter the number.
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