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It's hard to tell from the pic but it looks like there might be a resistor missing just above the sbus pin..?
set sbus_inversion = OFF ?? [OFF,ON]SBUS inversion ONLY ON F3 TARGETS.
Do you know if the sbus signal from the futaba receiver is inverted or not? Some receivers are, some aren't. If it's the wrong way round for your flight controller then you wouldn't get any signal, as you are seeing.If this is the problem then set up your receiver on a different serial port that doesn't have a hardware inverter built in and it should work.If none of your serial ports have working hardware serial inverters then you might need to buy a separate one because I don't think F4 boards do software serial inversion;https://github.com/betaflight/betaflight/wiki/Betaflight-specific-CLI-commandsOr it could be something completely different
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