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I'm getitng the same thing with my Arris SBG6580. It sounds like XFi is only supported on these 3 cable modems:
Which as far as I know... none of those are approved for resale. So XFi is limited to rental devices only... not that Xfinity will admit to that.
If you know of any approved cable modem that can be purchased and works with XFi, I would love to hear about it.
Hi Mcswaink! I can confirm whether or not your modem is compatible with the XFi app and help troubleshoot, as well as look into your speed issues, even discuss your billing. Please send me a private message verifying the first and last name of the account holder, and the street address associated with your services. To send a private message click on my name "ComcastChe", then click private message me.