HT206886: How to get macOS Sierra
Learn about How to get macOS Sierra
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Helpful answers
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Nov 18, 2015 5:10 PM in response to Joseph Goldbergerby Barney-15E,Same way as any other OS X that supports it, hold down cmd-R.
If you have a wireless keyboard, then sometimes the timing is tricky. You must wait until you hear the startup tone, then press the keys.