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It will because the Flex is IR controlled, just like my Comcast X1 DVR. But it won't give you vice control like the Comcast remote does.
Sorry, there was a problem. Please try again later.The Harmony 665 will work just fine with your Comcast Flex system. Check out the compatibility of Harmony with any of your other devices here https://support.myharmony.com/en-us/compatibility
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