It will take you approximately half an hour before it's completed. Open Terminal and paste this into Terminal window: sudo /Applications/Install\ OS\ X\ El Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ OS\ X\ El Capitan.app -nointeraction. Download El Capitan installer file from the Mac App Store and put it into the Applications folder.ģ. Find an external drive (a thumb drive will do) with at least 8GB of storage space.Ģ. The following steps will show you how to create such a bootable EI Capitan installer drive.ġ. For this purpose you'll need a bootable flash drive (USB) with El Capitan on it. Create a bootable drive of OS X El Capitanīefore you erase macOS Sierra from your computer, you need to download OS X El Capitan from the Mac App Store. * To begin with, make sure you have a Time Machine backup for all your files so that you can restore all your data by the end of the reinstallation process from Settings -> Time Machine. * You can't run the El Capitan installer within macOS Sierra, because the Mac always wants to have the latest version of macOS. * You can't boot your Mac into Recovery mode and revert to El Capitan because this method can only be used for reinstalling the system that's currently on the Mac, which in this case is Mac OS Sierra. Before you start, pay attention to those IMPORTANT notes:
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