Modern Windows (10/11) may block the legacy driver. You may need to disable "Core Isolation/Memory Integrity" in Windows Security settings. TechPowerUp Installation & Setup Instructions
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If you are comfortable with the risks, I can help you find a reliable BIOS for your card or explain how to create a bootable USB for flashing. ? AMDVBFlash / ATI ATIFlash 5.0.874 Download - TechPowerUp Modern Windows (10/11) may block the legacy driver
To the uninitiated, it looks like a relic. A simple command-line interface or a spartan Windows window that hasn't been updated aesthetically since the Windows XP era. But for GPU enthusiasts, ATIFlash 2.93 is the scalpel used to perform open-heart surgery on graphics cards. atiflash 293 install