How to Mirror an iPhone to Fire Stick

Step1: To begin, download the AirScreen app from the Google Play Store and install it on your Fire TV Stick.

Step2: Once installed, open the AirScreen app.

Step3: Select Start Now. And In the menu, select the gear icon to open Settings, and ensure AirPlay is enabled by selecting it to add a checkmark on the right if it’s not already there. Next, on your iPhone, swipe diagonally down from the upper-right corner to open the Control Center. Then Tap the AirPlay icon.

Step4: With Screen Mirroring active on your iPhone, return to the Fire Stick and confirm AirScreen is on the Home screen. If it isn’t, select the house icon on the left navigation menu. There, you should see a device name displayed on your TV screen.

Step5: On your iPhone, select the device name shown on the TV screen. Once connected, your iPhone screen will appear on the TV.

Credit : https://www.lifewire.com/mirror-iphone-to-firestick-5218579