To correct the output on the RX (mislabelled) for being able to get duplex communication.
As far as I know no one have come forward and validated it. There are also information that there might be another resistor on the otherside of the board that might need to be exchanged to get it working.
For now and without exchanging resistors? this telemtry guide will not enable to transmit commands to the QR X350 pro or enable changing of waypoints on the fly. Only transmitt status and telemetry data to the ground.