Radiomaster Boxer
betafpv nano 2.4ghz
iFlight Blitz F7 Whoop AIO

I've tried re-soldering, checking serialrx is on correct uart, changing firmware, nothing seems to work. would love some help.

Double check that you soldered the rx pad on the receiver to the tx pad on the flight controller, and vice versa.

You need to ensure that both your receiver and transmitter are both on the same major version of ELRS (both on v2.x or both on v3.x).

In the receiver tab in betaflight, select “serial (via uart)” for the receiver mode, and select “CRSF” as the receiver serial protocol.

Don’t forget to hit save prior to navigating to a different tab.

Make sure that serial rx is enabled *only* on the uart you soldered the receiver to.

Edit- if after that it still isn’t working, trying soldering it to a different uart.

Were you previously using this boxer radio? Is it new?

There’s a filter setting I had to remove. Also try calibrating your sticks.