1.  your Fire TV Must have root and busy box installed for this to work
2.  Download the firmware from rootjunkysdl.com; example bueller-ota-51.1.1.0_user_511069920-signed.bin 
3.  then rename firmware to update.zip
4.  place update.zip in this folder
5.  click on 2 amazon fire tv firmware installer.bat
6.  follow script to install
7.  if you are having trouble watch my youtube video on this process at www.youtube.com/tomsgt123