Not sure if it may help other people or not but I accidentally figured out that if I learned my Roku remote the keypresses worked perfectly with the firetv. No extra keys, no invalid commands. When I tried any other remote including my XBMC I got extra keypresses and wrong commands. So try a roku remote if you have one!
Using Flirc with Amazon fireTV
in How To
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Not sure if it may help other people or not but I accidentally figured out that if I learned my Roku remote the keypresses worked perfectly with the firetv. No extra keys, no invalid commands. When I tried any other remote including my XBMC I got extra keypresses and wrong commands. So try a roku remote if you have one!