I recently obtained a used iflight nazgul5 v2 analog 6s drone that is a plug and play. The person I bought it from has a Happymodel 2.4g ExpressLRS EP1 RX installed. I have a Radiomaster TX16s with a BetaFPV ELRS 2.4GHz Micro TX Module 1w. I updated the firmware on the RX and TX and I was able to get it to bind to my radio but when I plug the done into bet flight I get no stick inputs.  I even tried all of the Uart ports and made sure that the serialrx_inverted = off and serial_halfduplex = off and It still will not show up in betaflight. I read in the documentation that IFLIGHT_SUCCEX_E_F7 boards do not play well with UARTS. I went on the express elrs discord and they suggested that I need to rewire it. My question is if I wire the receiver to the marked pads in the picture will it fix it thus giving it different UART? Is there anything else that could be the issue? The person I bought it from said that he was using ERLS firmware 2.0 and it was working fine. I don't see how soldering the receiver should make it work and show up on betaflight. [

If you were previously using the plug/jack on the flight controller that is designated for the receiver, then no- that plug runs to t2 and r2, which is the same pads you’d be soldering to.

You’d want to find another unused uart.

Some flight controllers have a pull down resistor on the uart that they designate for the receiver, which doesn’t play nice with ELRS. That’s probably why they were suggesting a different uart.

However, if you are 100% sure that it was working on that uart via the plug on ELRS v2, it should be fine on ELRS v3.

Double check that your receiver wiring is correct. It should be connected rx to tx, and tx to rx.

In betaflight, on the ports tab, disable “serial rx” on ALL uarts except for uart2. Enable it for this uart, and do not select anything in the drop down menus to the left of it. Set all to disabled or auto. Don’t forget to hit save.

In the receiver tab, select “Serial (via uart)” as the receiver protocol, and select “CRSF” as the receiver provider. Don’t forget to hit save.

If that still doesn’t work, then go ahead and try soldering it to an unused uart. Try uart5 (r5 & t5).

As a side note, that red wire going to the 5v pad next to pad r2 doesn’t look like it has a good connection, and could be in danger of coming loose and shorting something out.

Also, you will need to have a battery plugged in to provide your receiver with power, so make sure you have one plugged in when you’re checking for stick movement in betaflight.

Make sure you also have a fan blowing over your vtx (and a vtx antenna installed) anytime you have a battery plugged in on the bench to keep it from overheating.

Thank you. I got it working. Now I have another issue that will post separately.

(11-Apr-2023, 10:14 PM)Helltothena4093 Wrote: Thank you. I got it working. Now I have another issue that will post separately.

How did you get it working? Uart2? I have that same FC/ESC

(12-Apr-2023, 12:58 AM)luispequeno Wrote: How did you get it working? Uart2? I have that same FC/ESC

https://www.expresslrs.org/quick-start/w...the-web-ui
Once you get the webui loaded, you want to confirm UART baud is set to 420000, and that Invert TX is NOT checked. If either of those are not correct, make the change and click save and reboot.