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Let me assist you and point you in the correct directions:
the manual for your Racestar FC and ESC is here (it is in picture form):
https://www.racerstar.com/racerstar-starf4s-30a-blheli_s-dshot-4-in-1-esc-aio-f4-osd-flight-controller-w-or-bec-current-sensor-p-195.html
What you want to do is use the PPM out from the Flysky iA6B, connect it to the PPM in of ...
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