On a 2015 Macbook Air in my case.

Make sure your Fedora is either:

• fully updated (won't work in outdated 33 where kernel-devel has a newer version than your current kernel)
• stable system (won't work in rawhide)

1. Plug into wired internet with an ethernet cable.

2. Enable third party repos with command from here: https://docs.fedoraproject.org/en-US/quick-docs/setup_rpmfusion/

3. install akmod-wl (which includes broadcom-wl)

    sudo dnf install akmod-wl
   
    sudo akmods --force
   

reboot. done!

if it doesn't work:

check your kernel with

uname -r

it should show the same version as the kernel-devel version above.