How to Bind SPI Frsky Receiver
Note: If you are using an EU-LBT firmware radio controller, please take a look at this article.
Power on the board, either by connecting the battery or USB power. Then the green receiver LED starts to flash.
Click the bind button for 3s. Then the green receiver LED will be solid on. This means that the receiver is in bind mode and you could start to bind your radio transmitter.
Now, on the radio, power on the radio and set the protocol mode to D16. Then enter the bind status.
The green receiver LED on the FC boards should flash slowly. This means that binding is successful. Then exit the bind status on your radio transmitter and the green receiver LED should be solid. This means the connection is ready.