I'm sorry about the issue. Is there any error or message?
What's the brand / model of the device you are trying to connect to your Xfinity TC805C modem/router's Wi-Fi / wireless?
Please let me know more details about the issue.
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What is the model of the device you are having issue with?
Do you also have a Windows xp, vista, or 7 or 8 or 10 computer, or a Mac computer?
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