You are using the b43 driver from linux-2.6.24

If you are using the b43 driver from linux-2.6.24, follow these
instructions.

Use version 011 of b43-fwcutter.
Download, extract the b43-fwcutter tarball and build it:

wget http://bu3sch.de/b43/fwcutter/b43-fwcutter-011.tar.bz2
tar xjf b43-fwcutter-011.tar.bz2
cd b43-fwcutter-011
make
cd ..

Use version 4.80.53.0 of Broadcom's proprietary driver.
Download and extract the firmware from this driver tarball:

export FIRMWARE_INSTALL_DIR="/lib/firmware"
wget http://downloads.openwrt.org/sources/broadcom-wl-4.80.53.0.tar.bz2
tar xjf broadcom-wl-4.80.53.0.tar.bz2
cd broadcom-wl-4.80.53.0/kmod
../../b43-fwcutter-011/b43-fwcutter -w "$FIRMWARE_INSTALL_DIR"
wl_apsta.o

Note that you must adjust the FIRMWARE_INSTALL_DIR path to your
distribution. The standard place where firmware is installed to is
/lib/firmware. However some distributions put firmware in a different
place.