Smartaudio not working with JHEMCU F405 NOXE v2

[obtuse brook]

I've built seven quads in total and have been flying/racing for 4+ years, and have never had a smartaudio problem until now. I'm using a JHEMCU F405 NOXE v2 flight controller and a TBS Unify Pro32 Nano. I've confirmed on another quad that the vtx works and is able to connect via smartaudio and change channel, so the vtx isn't the problem.

I've wired it all up according to the diagram on the product page, and I'm confident the wiring is correct. I've got the uart3 port set to smartaudio in betaflight configurator, and loaded the correct vtx table, but for the life of my I can't get smartaudio to work. In the video transmitter tab of configurator it says that the smartaudio version is undefined, and that the device isn't ready.

As per the diagram I had an ELRS receiver connected to uart4, and this worked perfectly. I then tried connecting the vtx to uart4, and still wasn't getting anything for smartaudio.

I'm at my wits end here. I've resorted to attempting to use ChatGPT for help, but it's not very good. The only thing it gave me that I haven't tried is using resource remapping to change an rx pad to act as a tx output. Any help or recommendations are appreciated.

EDIT: I should also add that the drone flies, and video is clear and strong, I just can't change the channel or output power. It's definitely not in pit mode. I've also unlocked the vtx

[hard nebula]

Hey! We think our bot can help with your question; click the button below to generate an answer.
Please also give us a support ID

1. Open the CLI tab
2. Click the "Submit Support Data" button
3. Optionally enter a brief description of the problem
4. Wait for it to finish
5. Copy the resulting support ID
6. Paste it here

{'cause': 'thread creation'}

[obtuse brook]

7bcf36ed-4de3-4738-b959-85ccc1e4b0a3

[stone goblet]

The vtx control protocol is determined by the firmware, not the flight controller. What version is the firmware?

[obtuse brook]

The version of the vtx firmware? I don't know how I'd check that. The vtx works with another flight controller running betaflight 4.5.1, and the flight controller it doesn't work with uses 4.5.2

It's definitely the flight controller that's the problem (whether that be hardware or software) as an identical vtx also doesn't work in this quad, but this vtx works in another quad

[stone goblet]

I also recently saw an error with the vtx protocol in 4.5.2, flash 4.5.1 or 4.6.0

[obtuse brook]

Yeah I'll give that a go

[obtuse brook]

That fixed it