WiFi stops working after install of latest 10.8.5 update on MacBook 5,1 third time reinstall OS X

WiFi stops working after install of latest 10.8.5 update on MacBook 5,1 third time reinstall OS.
MB used as email and surfing tool when on vacation. Worked fine for months. Installed the latest security patch (update) and WiFi quit working. Two days later (still on vacation) WiFi started working again and worked fine for the next 2 days.
Came home and formatted and reinstalled 10.8.5 and all was fine again. We are selling the MacBook and setup new user, everything worked fine.
The update came up again so I decided to install it and WiFi instantly stopped working after the restart.
Does anybody have any idea what is happening.
Thanks

Not really, although WiFi has been a longstanding problem for lots of people. I fix for some breaks others.
However, if you are trying to sell it, you need to revert it back to the OS that shipped with it. You cannot sell your copy of Mountain Lion with the Mac. It is only licensed to you.
You also need to include the system disks that came with the Mac. If it came with Leopard (10.5), and you have a Snow Leopard (10.6) disk, you can install that if you provide that disk also.

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