How to Downgrade macOS Big Sur to Catalina or Mojave

Jan 8, 2021 - 12 Comments

How to Downgrade macOS Big Sur to Catalina or Mojave

Did you update to macOS Big Sur but now wish you hadn’t? Are you no longer interested in using macOS Big Sur on your Mac? Perhaps you installed it to try out all new features and changes, but you’re not happy with it due to app incompatibility, performance issues, or some other problem that you haven’t been able to resolve. In that case, you may be looking to downgrade to an older version of macOS, like macOS Catalina or macOS Mojave. Fortunately, this is not a difficult task, so long as you make regular Time Machine backups of your computer.

Early adopters of macOS Big Sur or any major macOS software update in general would sometimes regret updating their device and may want to roll back to the older version that was installed. The easiest way to downgrade from macOS Big Sur is by formatting your Mac and then restoring it from a Time Machine backup that was made prior to the installation of macOS Big Sur.

Looking to roll back the software on your Mac to an older version? We’re here to help. In this article, we’ll be guiding you through the steps to properly downgrade your Mac from macOS Big Sur to macOS Catalina or Mojave.

How to Downgrade macOS Big Sur to Catalina or Mojave

Warning: Before you go ahead with any of the steps below, make sure you already have a Time Machine backup that was made prior to installing macOS Big Sur. If you don’t have a backup, you will not be able to downgrade, and doing this will simply result in permanent loss of data since you’ll be formatting or erasing your drive during the process.

Apart from that, if you have any important data or files that you created after updating to macOS Big Sur, you’ll need to manually transfer them to an external drive since this data won’t be restored from the Time Machine backup. Once again, do not proceed if you don’t have a backup.

  1. First of all, connect the Time Machine drive to your Mac. This drive should contain the backup of your Mac that was made prior to macOS Big Sur installation. You’ll be restoring your data from this drive.
  2. Now, reboot or restart your Mac. To do this, click on the Apple logo from the menu bar and choose “Restart” from the dropdown menu.\
  3. When your Mac reboots, immediately press and hold down the Command + R keys to boot your Mac into Recovery mode.
  4. Doing this will take you to the macOS Utilities screen. Here, click on “Disk Utility” to get started.

    How to Downgrade macOS Big Sur to Catalina or Mojave
  5. Now, select the disk drive where macOS Big Sur is currently installed from the left pane and click on “Erase” as shown in the screenshot below.

    How to Downgrade macOS Big Sur to Catalina or Mojave
  6. This will bring up the format options for the drive. Enter a preferred name for the drive and then choose the file system format as either “Apple File System (APFS)” (if you’re using a Mac with Solid State Drive) or “Mac OS Extended Journaled (HFS+)” (for Macs with mechanical and hybrid hard drives). Now, click “Erase” to confirm and format your Mac – THIS ERASES ALL DATA ON THE DRIVE, so don’t do it unless you’re absolutely sure that you have a backup!

    How to Downgrade macOS Big Sur to Catalina or Mojave
  7. Once the drive is successfully formatted, you’ll see the following screen. Click on “Done” and exit Disk Utility.

    How to Downgrade macOS Big Sur to Catalina or Mojave
  8. Next, choose “Restore from Time Machine” from the macOS Utilities menu.

    How to Downgrade macOS Big Sur to Catalina or Mojave
  9. You’ll be shown a brief description of this procedure. Click on “Continue”.

    How to Downgrade macOS Big Sur to Catalina or Mojave
  10. Now, your Mac will start searching for available backups. Choose the Time Machine drive that’s connected to your Mac as the Restore Source and click on “Continue”.

    How to Downgrade macOS Big Sur to Catalina or Mojave
  11. In the “Select a Backup” screen, choose the most recent backup from the macOS version you want to downgrade to. Next, select the name of the destination drive to restore the Time Machine backup of macOS to. This should be the same drive that we just formatted completely in Step 7. Now, click “Restore” to begin restoring the Time Machine backup to the selected drive.

    How to Downgrade macOS Big Sur to Catalina or Mojave

That’s it. Now, you just need to patiently wait until the whole process is complete.

Depending on the speed of your Mac’s hard drives and the size of the backup, the restoration and downgrade process could take a while.

Once the restoration is finished, the Mac will automatically restart and boot directly into the macOS version that was running when the selected Time Machine backup was made. For instance, if the Time Machine backup was made when macOS Catalina was installed, your Mac will reboot into macOS Catalina after restoration, and it will be as you left off the last time using Catalina.

Although we were obviously focusing on downgrading from macOS Big Sur in this article, these exact steps can be used to downgrade from any version of macOS. The only requirement is that you need to have a Time Machine backup of your data with the macOS version you’re looking to downgrade to.

This isn’t the only way to downgrade the software on your Mac. You can make use of the internet recovery method which installs the macOS version that shipped with the Mac, and then clean installing a prior macOS release. Don’t forget that you’ll still need a backup of your data to avoid losing your important files, apps, documents, and other personal data.

We hope you were able to successfully downgrade from macOS Big Sur to macOS Catalina or Mojave without any hassle. What are your reasons for not wanting to use macOS Big Sur? Did you use a different approach, or do you know any other methods to downgrade your Mac? Let us know your valuable thoughts and share your experiences in the comments section down below.

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Posted by: Hamlin Rozario in Mac OS X, Tips & Tricks


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  1. jack says:

    Big Sur drains the battery like no other macOS its a disaster and clearly created to force people to buy m1 MacBooks
    Tim Cook is a failure and he must go..

  2. Charles says:

    In step 11, how to you find the most recent backup from the macOS version you want to downgrade to. In other words, how do I identify the most recent backup from Catalina rather than Big Sur? Thank you.

  3. DaveC says:

    Your page is helpful but incomplete. You didn’t mention that you need to erase the HD-Data (volumed?) partition as well as the Mac HD partition. Also, in my case, restoring to a TimeMachine back up left the machine rebooting in recovery mode until I re-installed the OS on the (newly restored from TimeMachine) Mac HD. Took another hour after TimeMachine restore

    • Bt says:

      No the article is correct, you must erase the drive instead of partitions.

      If you erase the drive rather than the partition you do not need to manually erase the partitions.

      If you erase a partition and not the entire drive, you have to do as you described.

  4. Lee says:

    Staying on 10.14.6 Mojave, works perfectly on a 2011 and 2014 mac mini

  5. JohnIL says:

    I gave Big Sur a solid try out and felt it failed on so many levels I went back to Catalina. Big Sur is the result of what you get when young designers set out to prove you can bring a tablet experience to a Mac. But for me it was simply too much white grayish wash out contrast that did not help me with my older eyes.

  6. Paul J Darby says:

    I would dearly love to return to Sierra but do not have the confidence to do so.I have a time machine connected but when I try to access it there does not appear to be much there so I am reluctant to try.

  7. Rudi says:

    I’ve been waiting for this. Big Sur is a great heap of sh… Zero performance. Everything is slow and stringy. I run Mojave on an older iMac with less power where aps start immediatly in opposite to my new iMac and MacBook pro. Opening files from apps lasts up to a minute before the dialog box opens for the filesystem. Sometimes you scroll through information and then the system hangs for a two or more minutes with the spinning ball. I don’t know what Apple has done to Big Sur? Seems they want to bother Apple users away….

    • Peter says:

      Hello Rudi, sorry, but this is not Big Sur’s fault. Something on your HD is wrong. I have installed BS on 4 Macs and no trouble or slowness. You have either a System-Extensions-Conflict, contracting Startup Items, former bad Caches, bad Spotlight-Index, bad file-structure, that has now visibly caused BS to go slow. It may not have shown up earlier. But you will have to clean out the above and get it running then. I estimate that Macs older than the last 6 years may not be fit enough though. Regards, Peter

  8. G. Lance DIXON says:

    Need some 32 bit Apps.

  9. Daniel says:

    I had to do an Internet Recovery after a Big Sur crash left me with an Internal HD that I could not fix with Disk Utilities. For some reason it took me all the way back to Sierra (10.12.6). I’ve stayed there ever since and have had ZERO problems or headaches.

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