1. Open the "DOWNLOADER" app on your 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" on your Amazon FireStick/TV
4. Then Install, Open the app and add your m3u URL or File for Login
5. Your m3u file can be download from your Clientarea
6. Enjoy!

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