I must admit the title might be a little misleading, since I have not had anyone claiming problems like the “WiFi: no hardware installed”-error with the Atheros AR9280 AirPort-card and MacOSX 10.7.5 yet, but still…

…that is probably due to the fact that the MacOSX 10.7.5 updater doesn’t overwrite the IO80211Family.kext system extension. So if you are upgrading from an earlier version of MacOSX 10.7 “Lion” which you had already ‘patched’ for use with the Atheros AR9280, you won’t get any (new) issues…

Anyway…

If you do get the “WiFi: no hardware installed”-error after upgrading to MacOSX 10.7.5 (e.g. from MacOSX 10.6 “Snow Leopard” or earlier), you can just do the same ‘patch’ of reinstalling the old IO80211Family.kext system extension. Instructions for doing so can be found here :

https://macmanusnl.wordpress.com/2012/05/17/1074_refuses_to_see_atheros_ar9280/

Enjoy !