The computer I was working with had been purchased with Maverick installed, so I had to install that first, then upgrade to High Sierra (what is this, 2018? Why yes, yes it is. Step 12.5: Install operating systemĭepending on when you purchased your MacBook Air, you may have to install the original OS X from Internet Recovery and all subsequent OS X updates until you get to the system your computer was running before you started this whole mission. Only trouble can be caused from here past this point. Let Disk Utility do its job, and then get the heck out.
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