Wifi not working with t919 card on Big Sur

Wifi not working with t919 card on Big Sur

Hi everyone! I just installed big sur with a lot of struggle on my ryzen pc, and everything works fine, except for the wifi. I’m using a fenvi t919 card, which normally is supported by big sur. My router is detected but it’s struggling to connect with it (1st video below), and it’s « connecting » / disconnecting constantly, or not even trying to connect.

Bluetooth, iMessage and FaceTime are working, as well as iCloud and the app store, I tried with and without brcm kexts but it’s the same, the system report shows the card as « en1 » (screenshot), my ethernet is en0, and my system is based on iMacPro1,1 (I also tried with iMacPro19,1 and same story). I checked everything in the platform info and nothing seems incorrect to me. I’ve tried different things and nothing works so far. If someone could help that would be a real blessing!

There’s also something that I’m worried about, when I’m turning on my pc, at some point on the loading apple logo, sometimes the cpu fans kick on violently for like a 0.2 seconds (video 2), and I don’t really know why, also sometimes there are some micro bugs , I’ve had installed big sur on a previous configuration (I had an msi b450 and ryzen 7 2700x) and never had these issues, but was also struggling with the wifi on the previous config. (sorry for the mistakes, I’m french)

Here's my efi folder : https://drive.google.com/drive/folders/1MrwOa0A4tFmFQ-EMKR30qkfYxVDv3Ugl?usp=sharing

Config :

Ryzen 7 3700x

Asus B550M-A

RX 580

Nvme pny cs3030

Fenvi t919

https://preview.redd.it/agjlvz6d64g71.png?width=890&format=png&auto=webp&s=1db5d7f60bc6b516f489d83216a2e62ac3d5d876

https://reddit.com/link/p0cmop/video/p79zrz7974g71/player

https://reddit.com/link/p0cmop/video/99p8fij974g71/player

submitted by /u/budjdju
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