Apple How To Guide

How to Downgrade macOS Mojave Beta to macOS High Sierra

MacOS Mojave is the next major operating system for Mac – but just because you’re taking a new beta for a whirlwind, you’re ready to engage your daily driver. If you have decided to return to macOS High Sierra, you can downgrade in just a few steps. If you follow these steps, you will be back to your old configuration in no time.

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Some adventurous Mac users have installed macOS Mojave 10.14 beta on their compatible computers, either for development or testing purposes. Although beta software execution can be interesting and exciting, it can also be buggy, less stable than expected, or have some incompatibilities that make consistent use impossible or impossible. and return to a stable version of the MacOS system software.

We’ll see how you can easily switch from MacOS Mojave beta to another version of MacOS.

Note that this particular approach to downgrade the MacOS Mojave beta is based on a Time Machine backup performed prior to installing MacOS Mojave beta. Essentially, you will format (erase) the Mac and then restore from Time Machine using the backup you have at hand. If you have not made a Time Machine backup before installing MacOS Mojave beta, this technique will not work for you, and you will have to rely instead on the clean formatting and installation of an earlier version of MacOS.

How to downgrade the MacOS Mojave beta to MacOS High Sierra: If you decide that the MacOS Mojave Beta just does not work for you, you can go back to High Sierra.

Important: Back up your Mac

This process will completely erase MacOS Mojave from your hard drive. This means that any files, programs, or documents that you have worked on using macOS Mojave will also be erased if you do not back them up first. Use an external hard drive or a cloud-based program like DropBox, OneDrive, or iCloud. If you do not save these important files somewhere out of your computer, you will lose them ….

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How to Downgrade MacOS Mojave Beta

The guide assumes you have a Time Machine backup made from prior to updating to macOS Mojave beta, the backup can be for another version of MacOS like Sierra, High Sierra, or El Capitan. If you do not have a Time Machine backup from a prior MacOS build, do not proceed with this approach….

You must first clear macOS Mojave before going back. Therefore, make sure you have the latest backup of your computer.

  1. Click the Apple icon at the top left of the screen → choose Restart from the menu.
    Then you have to press and hold Command + R . Make sure to keep the keys until your Mac restarts.
  2. Your Mac will now enter recovery mode. Then click Disk Utility in the OS X Utilities and select Continue .
  3. Click the Startup Disk and select the Clear tab at the top of the window.
  4. Next, you must enter a name for the file you wish to delete. This could be something like MacOS or MacOS High High Sierra.
    # You must choose Mac OS Extended (Journaled) from the list of formats if your computer uses HFS +. If you are using APFS, you will need to choose APFS.
    # Choose the GUID partition map, if there is a schema. At the end, click Clear.
  5. Once your computer is cleared, exit the Disk Utility from the drop-down menu in the upper left corner of the screen to return to the OS X Utility Selector.

Reinstall macOS High Sierra

After clearing macOS Mojave, you will need to reinstall a previous operating system.

Did your Mac use MacOS High Sierra since the beginning? Then you can quickly return to this operating system. To do this, simply restart your computer by pressing Shift-Option-Command-R.

In case your computer does not ship with High Sierra, follow the steps below.

  1. Click the Apple icon at the top left → Restart in the menu.
    Then you have to press and hold the option. Then you will be prompted to choose the boot disk. Choose your boot drive with macOS High Sierra from the list of boot disk options. The installation will start now.
  2. Now, click Continue in the macOS High Sierra installation window.

Then you must accept the terms and conditions. Then the operating system will reboot on your Mac.

Once you have installed High Sierra on your computer, you can restore it from the most recent backup. Keep reading …

Restore from the last backup

  1. Make sure you have the proper internet connection. Click the Apple icon and choose Restart from the menu.
  2. Now, you have to press and hold Command + R and make sure to hold down the keys until your Mac restarts.
    Next, you must choose Restore from Time Machine Backup in the OS X utilities and press Continue.
  3. Choose the backup source and click Continue.
  4. Final step, click on Continue.

Then you need to choose the latest macOS High Sierra backup.

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