Same On SpeedybeeF7V3 with a taranis 9XDlite. I solved the problem disconnecting first the VTX DJIO3, and disconnect the 2 lasts cables (RC) pins ( DJI remote control cables ) . then i connect the Receiver and the VTX with the only 4cables (5V/GND/TX/RX and not the others) and it works . (...