First of all, Thanks to the contribution of MIDELIC & BetaFlight Team in the design & development of FRSKY RX compatible codes
Pls update your transmitter with last OpenTX firmware.
1. Power FC via USB or LiPo normally, RX LED(Green) blinking slowly
2. Connect FC to configurator, Choose “SPI RX support” & “Frsky_X” in Configuration Tab–Receiver mode (They are set by default after flashing)
4. Start Transmitter in bind mode, the RX LED will fash slowly – Bind complete.
5. After CLI “defaults” or reflashing, SPI RX should be bound again.
Need 200~300ohm resistor to be connected to RX1 or RX2 pad in series
RX1 or RX2 hole —–> 200~300ohm —–> Camera OSD
TX1 or TX2 can be used for VTX control with no confliction
with BF4.0, CLI bind command “bind_rx_spi”