SP racing f3 problem

[spice hollow]

Guys I have a old drone which does not work I recently opened it up to see a Seriousyl pro f3 flight controller and fly sky i6 receiver with 4 bldc 1400kv motor and 4 yellow wrapped ESC which are probably switched ESC. I flashed the spracing f3 somehow after watching dozens of videos and now it connects to betaflight but I am still not able to give signal from fly sky i6 receiver to my controller and in the receiver tab of my beta flight all inputs are grayed out. I used uart 2 3 wire black red white wire into the horizontal servo pins of my receiver as I saw in a video but I still can't control my motors through the spracing f3 controller. All the 4 motors work through direct receiver normally

[limpid tundra]

I have this fc flying a 3” at the moment. I advise you clean off the rust before you do anything further. Please show the receiver wiring on the board and the rx

Also, note that this fc had issues with motor pads dropping out. I had to re-assign motor 2 to motor 5 pad in cli to get a 4in1 esc to run on it.

[spice hollow]

I used ibus configuration as shown in many videos of this specific controller and receiver but my controller doesn't seem to get any signal from the receiver. I don't see any visible rust on the controller either but I'll clean it anyways. I also used a video in order to flash it with a new firmware which seemed to work because it atleast connects to my laptop via betaflight now and sensors work and show perfectly. I also thought of trying pwm connection but that seems too complicated and I don't think it's better than ibus

I was also thinking of buying new jst connector for the io2 port as the one I'm using rn is very flimsy and not in very good shape. Only reason I think wire is fine is because it powers my fs-ia6b receiver and it works fine. All the problem seems to arise from the white signal wire which I tried connecting directly to uart 3 RX port but that didn't solve my problem. I am hesitating to update my firmware as it might get bricked as it's old and can't support new firmware

[spice hollow]

my motors are constantly beeping as well

[spice hollow]

Nvm it's fixed I did it finally I just flashed betaflight 4.1.1 performance firmware and everything worked properly my connections are all fine