XFX RX580 8GB GTS BLK Edition - UEFI CSM Bug - Bios Flashing Help

[Tsukuyomi43434]

Hello,

I recently bought a used XFX RX580 8GB GTS BLK Edition for my Hackintosh setup. I wanted to test it in Windows 11, but I'm encountering an issue: when I plug the DisplayPort or HDMI cable into the card, I get artifacts during boot. I believe this might be related to the well-known UEFI CSM bug with XFX cards, as discussed in these threads:
https://www.techpowerup.com/forums/threads/xfx-rx580-8gb-gts-xxx-edition-uefi-csm-bug.242705
https://www.techpowerup.com/forums/threads/xfx-rx-580-8gb-uefi-csm-bug.296906/

The card has a dual BIOS, and I’ve uploaded photos of the VRAM, all the labels, and the details from GPU-Z. I’m considering flashing the card with a more compatible BIOS, either a newer XFX version or perhaps a Sapphire BIOS, as I’ve read that XFX cards can sometimes cause issues with macOS.

However, I’m a beginner when it comes to flashing GPUs, so I would really appreciate it if someone could recommend a suitable BIOS and provide instructions on how to flash it properly.

Interestingly, if I boot using the iGPU and then plug the DisplayPort into the RX 580 afterward, the card works perfectly fine.

If more data or images are needed, I'd be happy to send them directly.

Thanks in advance for your help!