I have been fighting this for two days now.
2013 Macbook Pro running Linux Mint 15 with Unet. Have BCM4331 Network controller from Broadcom.
These posts are as far as I have gotten. I am in serious need of help. I followed the instructions exactly but to no avail.
The following seemed to execute successfully:
tar xfvj broadcom-wl-184.108.40.206.tar.bz2
sudo b43-fwcutter -w /lib/firmware broadcom-wl-220.127.116.11/driver/wl_apsta_mimo.o
and yet... no poof for me