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Nikita haha by default it connects by ppm to rxsr receiver (cppm out on board -> ppm / sbus in on receiver) so rxsr should be in ppm mode (press bind button for 4 seconds) and ppm to be configured in betaflight. and rx1 on board connecting to sbus out on receiver (why?). otherwise need to change wires 4 and 5 on connector so rx1 will connect to sbus in, but i just left it as is and use ppm.

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Nikita disable smartaudio in ports tab in betaflight. uart3 - > set to disabled. it helps. otherwise changes you did by button being overriden by smartaudio default values.

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