ANSWER:

According to your installation page, the brcm80211 driver is embedded in the kernel. Therefore, modprobe is not working as there is not brcm80211 driver that can be (un)loaded.

The package you installed contains firmware not the driver (as you can read on the installation page you provided).

You somehow have to tell the brcm80211 driver that is has (new) firmware it should use. As modprobe is not working, you’d needs something else.

Personally, I do not know how to restart a embedded kernel driver… Expect jsut restarting the kernel (ie restarting your machine)…

Hopefully this will help you understand things a little more.

by Veger from http://unix.stackexchange.com/questions/37112