I just followed your instructions and bluetooth worked fine afterwards. But I realized that mac address spoofing of the Wifi card did not work any more. So since I prefer spoofing my mac address over bluetooth, I purged the atheros firmware afterwards.
The strange thing is: bluetooth is still working and mac address spoofing is still disabled. The firmware package is removed, so
dpkg -l
does not list it any more. How can that be possible?