In the Mac App Store, download the operating system installer. Otherwise, call a friend who also owns a Mac and ask nicely to use theirs to make the bootable USB stick. If your current OS installation is still functioning, you should be able to get there. Next, you’re going to head on over to the Mac App Store on a Mac laptop or computer. Now, click on the “Erase” button and the Disk Utility will prepare the USB stick for the next steps you’re going to follow.ĭisk Utility will let you know when it’s completed the task once it’s finished, close Disk Utility. Leave the USB stick named as “Untitled.” Make the format “Mac OS extended (Journaled)” and use “GUID Partition Map” as your scheme. 
Click on your USB stick, then select “Erase.”.Once you open Disk Utility, you’ll see your USB drive listed. You’ll have to prepare it by going to Applications > Utilities > Disk Utility. Make sure you have what you need from it, because you’re going to erase it and make it Mac compatible. Before you do anything with the USB stick, it must be 8GB in size or larger.
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