Please follow the steps below exactly to make the pairing done:
1)Turn on GPS high accuracy and permission for Tello APP.
2)Turn on Tello.
3)Turn on phone WiFi and connect to Tello.
4)Turn on bluetooth on phone but DONT CONNECT TO ANY DEVICE.
5)Turn on Gamesir by pressing A button and power button simultaniously and holding for 2 seconds to make visible.
6)Open Tello APP go to setting bluetooth controller and click Gamesir. If it doesnt connect you probably didnt turn on GPS.