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Worst case I can think of is that the driver wont load or not load correctly... all you have to do is replace the patched kext with the one you backed up. But if you dont know how to do that then I would say do not do it.

I don't know what i am doing so I will take your advice and not do it. Perhaps after others have been successful.
 
i only had 384mb on my hd4000 when i first got my 2012 13" with 4gb ram. got 512 now with 10gb ram
 
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