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The CM700 modem only has a 3.0 DOCSIS channel. You'll have to buy another modem that is 3.1 DOCSIS. If you go to your account on the Xfinity website you'll find a tab for compatible modems appropriate for your speed plan. I've made some recommendations below and hopefully one of them is compatible for your service. I sorted them from least to most expensive for your convenience.
I would recommend:
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