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Uploaded on Feb 7, 2012
Some Mac users who upgraded to Lion (10.7) discovered that the wireless connection is unstable. It'll drop or disconnect you randomly. Or what's worse, the Airport icon will show you have full bar reception, but you cannot load any websites.
The issue is due to a bad kernel extension file (kext). Think of kext as "drivers" in the Windows world. Lion has a new set of kext files, in which the wireless kext files are not working normally. The fix is to use the old Snow Leopard (10.6) kext files because your wireless must have been working before.
Instructions: 1. Download the kext file here: http://www.sendspace.com/file/jy1b4k 2. Unzip the file 3. Drag IO80211Family.kext and drop it to Kext Utility. This will launch Kext Utility and update your kext file. 4. Turn off your Mac when the program is done. Wait 1 minute and turn it back on.
Note: DO NOT just double click Kext Utility. You must drag and drop the .kext file. This tells Kext Utility to use the .kext.