Major GPU OEM Colorful seems to have entirely omitted download links for Resize BAR BIOS updates on its technical support page. This leaves Colorful graphics card owners with no way to enable the feature, at least until the OEM fixes those broken links.
https://www.notebookcheck.net/Colorful-seemingly-forgot-to-post-Resize-BAR-update-files-for-NVIDIA-GeForce-RTX-3080-and-RTX-3090-owners-amid-a-confusing-feature-rollout.530392.0.html