Recently, user rbox at the XDA Developers community, managed to create a custom recovery tool, based on TWRP recovery for the FireTV 2nd Generation. He publicly posted scripts, binaries and instructions, se everyone can replicate his rooting and custom recovery installation experience on their FireTV 2nd generation. You can read and comment on his brilliant work in first hand by following this link. A word of caution: We assume this is a dynamic situation and although at the time of this tutorial the procedure is successfully performed on Version 5.0.4 or later of  FireOS, this may change in the future. Once in place, this custom recovery tool will allow you to easily install any future pre-rooted Android OS...
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