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OS X Mavericks on my Dell Latitude E6400


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I have installed OS X 10.9 on my latitude E6400. Everything including ethernet and sound are working, except wifi. 


I have BCM4312, so I used did various things including copying and AirPortBrcm4311.kext into the original IO80211Family.kext (and applying chmod +x), replacing IO80211Family.kext with my working Lion kext (I could never update to Mountain Lion and gave up). Replacing IONetworkingFamily.kext. After these procedures, the wifi does show up but I always get "Connection failed".  I noticed that that the wifi connects only when there is no WPA Personal or  WPA2 Personal key. But I cannot disable wifi security key in my network for security reasons. 


Could anybody tell me what the problem could be?

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