It would be great to see the Roku 2 xs (3100) added to the list soon.
Also, improved training for support staff regarding Roku compatibility would be helpful. I had an excessively long online chat to find out two things: 1) the Showtime Roku App is not available for Comcast Showtime Subscribers and 2) I was getting an error message when trying to download the Xfinity Stream Beta App because my Roku 2 was the wrong Roku 2 model (I was unaware there was more than one Roku 2 model). I suppose I could have gone to Roku support; however, Comcast online staff should be able to quickly diagnose and provide this information.
is your's a Roku 2 (4210)?
He states that his is a Roku 2XS, Model No. 3100. As far as I know, this model, which I also own, is not supported by the Xfinity Roku App. Strange, as it is a high end Roku 2 model, with an ethernet port, and a built-in Angry Birds app :)
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