Once your thumb drive is formatted and the macOS installation package has finished downloading, open up Terminal (found in Applications/Utilities).ģ. Name the USB drive “Untitled” if it isn’t already, choose the Format “OS X Extended (Journaled)”, and click “Erase”. Open Disk Utility (found in the Applications/Utilities folder), select the thumb drive in the sidebar and click the “Erase” button.Ģ. Once it has downloaded, follow these steps to create a USB bootable installer.ġ. Now that we’ve considered the question of whether or not to do a clean install, here’s how you can do a clean install of macOS Sierra (courtesy of MacRumors):ĭownload the macOS Sierra installation package from the Mac App Store. How to do a clean install of macOS Sierra
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