This is an unofficial layman overlay for Gentoo Linux. This overlay contains a patched version of net-wireless/broadcom-sta to work with >=linux-5.10 kernel.
Applied patch is: https://raw.githubusercontent.com/archlinux/svntogit-community/f5bb5d3bff311ff48d36061b249a472098fed968/trunk/011-linux59.patch
Thanks to Arch Linux community for this patch <3