How to upgrade mRO air telemetry without the FTDI chip?

mrobotics has come with a new radio system which is neat in the sense that it does not carry the FTDI board which is basically needed only when you need to update the firmware. My only question is how do we update the firmware on this by connecting it FTDI. The VCC/GND/RX/TX pin is clear but what about the other two pins. How can they be connected to update the fimrmware.

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