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Thursday, September 11th, 2025

Activate modem without app

@XfinityMarcus​ I cant use apps. How do I do it from my laptop?

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Expert

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113.3K Messages

2 days ago

Connect it to the coax line / outlet and power it up. Let it fully sync up with the system. Check that the front or the top panel indicator light(s) is / are steadily lit.

(Not sure if this method works anymore YMMV). Then try calling 1-855-652-3446. That is their self-install device activation line. Have the RF / CM / HFC MAC address and the serial number of it handy when you call. Good luck ! Please let me know.

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