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McSlipper Idont know a JR9XII Transmitter. But you need to use OpenTX (OpenTX is open source firmware for RC radio transmitters) and a JR Modul Socket in your Transmitter. If its JR or GRAUPNER i still remember they have an own company firmware. So check if you can use OpenTX as Firmware
2021-01-20 11:56:55 Helpful (0)