https://help.ubuntu.com/community/Wi...etween_drivers

You'd follow the stuff for b43. Probably the easiest would be to disable the STA driver and install b43-fwcutter and firmware-b43-installer, restart and see what happens. You may need to blacklist a thing or two. Never tried it. Never used the STA (as it didn't like the card on a HP laptop which I no longer have).

If you want to start a new thread asking how to switch between the two, feel free (but try the above first).