How to reconvert Amazon android to fire os

Hello guys
Today i share with all of you how to downgrade Amazon Android to fire Os…
1. First of all download this update.. (…deId=201531560)
2. then download adb (Android Debugging Bridge) from here..
([TOOL] [WINDOWS] ADB, Fastboot and Drivers -? | Android Development and Hacking)
3. then install adb fastboot…
4. and put your phone into recovery mode.. and click on side load..
5. connect your phone with pc open cmd type adb side load then give your fire update path press enter..
it will be finished in few minutes…
and dont forget to clean cache and data of your phone after doing this..
if you face any kind of problem then contact me