Extract it using archive manager, then you'll be left with 'wl_apsta.o.lzma'. Open it with archive manager, and extract it. Now for the hard-ish part:
You'll need build essential, so:
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sudo apt-get install build-essential
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cd
wget http://bu3sch.de/b43/fwcutter/b43-fwcutter-011.tar.bz2
tar xjf b43-fwcutter-011.tar.bz2
cd b43-fwcutter-011
make
cd ..
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export /home/adam/Desktop=”/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
sudo ../../b43-fwcutter-011/b43-fwcutter -w /lib/firmware wl_apsta.o