Instal KODI on Fire TV

4.2 Procedure
Install / side-load Llama.
Install “Classic TV” (or “ikono TV” in the UK) app from Amazon app store.
Launch Llama (From FireTV - Settings > Applications > Llama > Launch Application).
Go to EVENTS on top menu and click '+' to add a NEW EVENT.
In your NEW EVENT select ADD CONDITION then, from the Menu select 'Active Application' and select 'Choose App’. Scroll through the list of apps until you find “Classic TV” and select this app. Doing this should return you to the Events Menu.
Next, select ADD ACTION and select 'Run Application' from the Menu list. From here, select whatever the name of your Kodi build is. That should create your event. At this point you can also name your event to distinguish it from others.
Now when you start the “Classic TV” app from the Home Screen, it should automatically open XBMC. Feel free to experiment with other apps from the FTV app store. Just be aware that some will loop back and re-start Kodi when you try and exit Kodi to get back to the FTV Home Screen.