1. Open the "DOWNLOADER" app in Amazon FireStick/TV
2. Download & Install the "IPTV4LESS" app from https://iptv4less.com/apps/iptv4less.apk
3. Enable the "Install Apps from Unknown Sources" in "Settings" >>> "Developer Options" in your Amazon FireStick/TV
4. Then Install, Open the app and Enter your Route Number for Login
5. Enjoy!

How to enable the "Install Apps from Unknown Sources" in New FireTV devices