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So this is the f4s flight controller I have. I only see a sbus/ppm at the top right. So can I just put the spektrum reciever onto that and it’ll work? Thanks for the replies

Hello, I need help. I have a Racerstar F4S flight controller and I have a dsmx reciever. I’m hearing that I need a 3.3v buck or a 3.3v step down to make it work. I don’t know if that true or what but I need help with wiring the reciever to the fc and how to make it work in betaflight. Thank you