Like I said, change it on either the receiver or FC, it does not matter. As long as you don't do it for both, the end result is the same. Personally, changing it on the FC is likely easier because the pads are bigger.

I am a little confused, did you put the Crossfire receiver in yourself or was it already there from the seller? Since you do not have a soldering iron, I assume it was from the seller. And if it is from the seller, then there is no way the receiver would have worked like that (as mentioned before).

Yes, I did not put the receiver on. I personally would've preferred a different receiver protocol but tbs is fine. Yeah, like I mentioned the seller remains fairly convinced he did not scam me.

Well the wiring doesn't lie. That quad has never flown in that state. Maybe the seller didn't intentionally scam you, but it's evident that you weren't sold the quad with the same setup as the one you saw flying. Whatever the explanation, I don't think you are going to have any recourse for getting your money back with more than 6 months having elapsed since the transaction was completed.

If you're unable to get Serial RX swiched on using another computer or an Android device, you are going to need to look at getting a new FC.

So even after i change the wires thats not gonna change whether i can turn on serial rx? On another note what is a recommendation for a good FC thats not too expensive. Maybe i should start a new thread.

(20-Oct-2023, 11:16 PM)hobbyczar Wrote: So even after i change the wires thats not gonna change whether i can turn on serial rx? On another note what is a recommendation for a good FC thats not too expensive. Maybe i should start a new thread.

Incorrect physical wiring to the FC has no effect on what you can change the settings to. If the wiring or settings are incorrect then the external peripheral just won't work. So once you correct Crossfire Nano RX wiring you are still going to have the remaining issue of not being able to switch on Serial RX, which needs to be ON for a Crossfire receiver.

One of the minor complications with getting a new FC for that quad is that your quad is running separate ESCs on the arm which must be connected to a PDB (Power Distribution Board) under the FC. I can't see what board is under the FC in your photos so I'm guessing that is what you have because it is the only way to power 4 separate ESCs when using the Helio Spring FC. Depending on how the Helio Spring is wired to the PDB will depend on what replacement FC is going to be suitable in order to minimise the amount of rewiring you are going to need to do. If you are able to post some photos of that underlying PDB board so we can see what it actually is and how it is currently wired up, that would be helpful. You will need to take the 4 nuts off the top of the stack screws and then carefully lift off / move aside the FC to reveal the underlying PDB.