Ever since downloading OS X El Capitan there seems to be an issue with my wifi. I have tried to restart my computer and even restore it. The wifi will either be unable to turn on or will have a message saying that there is no hardware installed. I was any way in which i could go back to the old program run by my computer (Macbook Pro 2011) or if there is a way in which i can fix my wifi as non of the new updates seem to be helping it.
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