I tried to add another Arris router to my home not knowing you can’t connect two modems. I have a large house and the internet is slow upstairs even with the mesh router. When I realized it didn’t work I tried to go back to using the arris surfboard SB6190. The lights are white, blue, blue, white however Xfinity says they can’t activate the modem. What happened that it worked fine before and now isn’t working? I have tried a hard reset and that didn’t work either.
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