Under External, select your USB flash drive and press Erase.Ħ. Connect your USB flash drive to your computer and open Launchpad > Other > Disk Utility.ĥ.
Now we will need to create a bootable USB. Don’t worry, this is normal since the system will not just let you install an older OS.Ĥ. If you get prompted with “This copy of the “Install macOS” application is too old to be opened on this version of MacOS”, hit Quit. Press Download - this step may take awhile since the download file is huge.ģ. Download the macOS you want to downgrade to from the App Store. In this tutorial, I will be downgrading from macOS Mojave to macOS High Sierra, but the instructions are the same if you are trying to downgrade to another macOS version. You will also need an empty USB flash drive for this tutorial. Please backup all your files before you begin. In this tutorial, I will be downgrading from macOS Mojave to macOS High Sierra, but you can downgrade to other macOS versions as well by following the instructions.īefore we begin, please note that in order to downgrade macOS, you will need to reformat your hard drive - meaning you will lose all of your data. We provide a step-by-step guide with pictures of each step. Are you trying to downgrade your macOS? Follow our tutorial to get started.
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