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Yes you can use both.
Sorry, there was a problem. Please try again later.Yes, you can use Amazon Fire TV Stick on this TV w/ Roku. I do this myself, just change to the input that the Fire TV Stick in in, (HDMI 2, HDMI 3) and the Fire TV Stick will start. - - - - - - To your 1st question, the Fire TV Stick should work regardless on what TV service you have, it's completely separate from each other since they are on different inputs (HDMI 1, HDMI 2, etc).
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