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Q: How to reinstall OS X from USB drive without losing all data

My Macbook Pro is very slow after updating to OS X El Capitan. Apps launch slower than Mountain Lion. How can i reinstall OS X from a USB drive without losing all of my data.

MacBook Pro, OS X El Capitan (10.11.6)

Posted on Sep 4, 2016 6:49 AM

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Q: How to reinstall OS X from USB drive without losing all data

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