HT201541: Update the software on your Mac
Learn about Update the software on your Mac
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Helpful answers
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Mar 10, 2013 10:02 PM in response to imdad.shaikby sberman,I'm not sure you can do it. But if you can (depending on the specific model you have), this should help:
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Mar 10, 2013 10:07 PM in response to imdad.shaikby sberman,Here's another article that says you cannot upgrade the MacBook Pro with Retina memory: