Step 1: Get a wired connection to the Internet.
Step 2: Configure RPM Fusion. Download both free and non-free repository
# rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm
# rpm -Uvh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm
Step 3: Install the Broadcom wireless driver package
# yum install broadcom-wl
Step 4: Finally Try loading the driver
# modprobe wl
If the modprobe doesn't work, just reboot
# reboot