I also have that problem with a Broadcom 4306 Rev 03 card. google revealed this 
http://www.linuxwireless.org/en/users/Drivers/b43#bcm43xx.2Cb43legacy.2Cb43.2Csoftmac.2C...thefullstory
 
which states

"4306 and 4309 cards with a MAC core revision of 4 or less should also
use b43legacy."

and a bit further down

"always build both b43 and b43legacy (and get firmware for both too).
The kernel autoloader will automatically do the right thing and load the
correct driver for your device."

Which makes me wonder, the "Rev 03" printed during boot is not the MAC
core revision or there is a bug with selecting the correct kernel driver
for the cards with MAC core revision < 4. I tried putting the b43 driver
as blacklisted, but that didn't give me a b43legacy driver loaded at all
and modprobe for the driver didn't help that much either.

I can attach output from lspci and friends in a later post if needed for
further fault isolation.

-- 
Broadcom 4306 doesn't work! I cannot connect to any wireless network
https://bugs.launchpad.net/bugs/210373
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