macOS Tahoe arrived on Macs on September 15, 2025. Many people raced to install macOS Tahoe and love it, while others have installed the updated only to regret it later. Perhaps you’re struggling with Liquid Glass visibility issues, maybe you have discovered that an app you rely on no longer works or is buggy? Maybe you hate one of the new features? Or you are frustrated that your Mac can’t take advantage of all the new features because it doesn’t support Apple Intelligence.

It’s not always a completely new version of macOS you want to revert from either. Apple issues multiple point updates throughout the year and if something breaks on your Mac following that update you may want to go back to the previous version. This could be from Sequoia 15.7 to 15.6, for example, or it could be revering from macOS 26.1 to the original macOS 26.0.

Luckily it is possible to revert to the previous version of macOS from before the update, but, unfortunately, it isn’t as simple as finding the older version of the Mac operating system and reinstalling it–and it can mean you lose some of your data.

Below, we’ll run through the steps to downgrade your Mac from the latest version of macOS Tahoe to Sequoia, from a version of macOS Tahoe to another version of macOS Tahoe, and even from Sequoia to Sonoma.

• If you need to run an older version of macOS on a Mac we have a separate article that looks at various ways to downgrade to older versions of macOS.
• If you want to downgrade from a beta version of macOS we have a separate article dealing with downgrading from a beta version of macOS.
• If it’s iOS you want to roll back it’s not so simple because Apple stops older versions of iOS being available. Read about how to downgrade from iOS 26 to 18.

How to downgrade from Tahoe to Sequoia

Chances are you arrived on this article because you have updated to macOS Tahoe and regret it. The process is just the same as if you are reverting from a minor ‘point’ update to macOS though, e.g. macOS 15.7 to macOS 15.6.1.

The good news is it can be done. The bad news is that you will need to wipe your Mac to do so. The method you follow will be determined by whether of not you already have a backup (and how old that backup is).

If you have a backup from before the macOS update, all you need to do is wipe your Mac and then recover your backup with the older version of the backup from before your update to the new macOS.

(Reminder: This will erase your Mac, so do make sure you have a backup of important files.)

The easy option: How to revert a macOS update using Time Machine

If you have an older Time Machine backup from before you upgraded the downgrade process is relatively easy. With your pre-Tahoe Time Machine backup in hand, you can recover your machine from before the update and then copy back any files you created after you installed Tahoe.

This is our preferred method because Time Machine backs up your settings and apps so that when you recover from that backup everything is exactly the way you are used to it being, which can be comforting. As long as you have old backups you should be able to go back to a date before your upgrade and recover that version of your Mac. Just remember that anything you have done since then will be lost because you’ll wipe everything on your Mac as part of the process, so you will need to make a non-Time Machine backup of those files.

Here’s how to recover the old version of macOS using Time Machine:

1. Plug your Time Machine disk into your Mac.
2. Restart your Mac.
3. On an M1 or later Mac you need to press and hold the power button until the Options menu comes up. (For older Intel Macs hold down Command + R until the Apple logo appears.)
4. When the options appear on the screen, choose ‘Restore From Time Machine Backup’ and click Continue.
5. The next screen will show the words Restore from Time Machine, click Continue again.
6. Next, select your Restore Source – this should be your backup drive.
7. The next screen shows all your backups over time, pick the last one you made prior to updating to the newer version of the Mac operating system. (You can see which version of macOS the back up was made in).

Once you have restored the older version of macOS from your Time Machine backup, you can recover the files you created since you updated from your non-Time Machine backup.

The more difficult option: How to wipe your Mac and install an older macOS

But what if you don’t have a Time Machine backup?…

If you don’t have a Time Machine backup the method is a little more complicated because you need to wipe your Mac and then do a clean install of the macOS you want. Because it involves wiping your Mac you will still need to back anything you don’t want to lose up – and for your backup you should use a backup tool other than Time Machine.

Why you shouldn’t use Time Machine for this backup: Apple’s Time Machine is no good here because when it backs up your Mac it will back up the current version of macOS as well, and when you recover your Mac from the backup you’ll recover that version too. You could use a tool like Carbon Copy Cloner (which has a free 30-day trial or costs £52/$49.99), and doesn’t make you back up the operating system. Check out our recommendations here: Best backup software for Macs. We also have advice about How to back up a Mac.

How to fix problems downgrading a Mac

These things don’t always go smoothly. Here are a few issues you might encounter:

Wiping an older Mac

If your Mac is old and isn’t running Monterey or later, you will need to erase your Mac following the steps in our tutorial on wiping a MacBook or Mac. We recommend that you follow that tutorial as there are a lot of steps you should take to ensure that you don’t create more problems for yourself.

What to do if booting from external media doesn’t work

If you are using a Mac with a T2 Chip then you need to ensure that you enable booting from external media or this will not work. To do this you need to access Recovery Mode and then choose Startup Security Utility from the menu. Here you will see a number of options including those for Secure Boot and those for Allowed Boot Media. It is in this second section that you will find Allow booting from external or removable media. You will need this selected to boot from a bootable drive.

What to do if the old macOS won’t install

If the above doesn’t work you may need to completely wipe your Mac before reinstalling macOS from the bootable drive.

We explain in detail how to erase a Mac in this article: How to erase a MacBook or Mac: restore to factory settings and we advise that you follow that tutorial. If you have a Mac with T2 chip, or an M-series Mac erasing your Mac is very simple thanks to the Erase All Content And Settings option. This setting used to be found in the menu of System Preferences but with the arrival of System Settings it’s now located in System Settings > General> Transfer or Reset.

Reinstalling an older macOS via Recovery mode

Depending on the age of your Mac there might be an option to recover the original version of macOS it shipped with using macOS Recovery.

You won’t be able to revert to something older than the macOS your Mac shipped with.

Follow these steps to reinstall the version of macOS your Mac came with, or one that is close to that:

1. Turn off your Mac.
2. For Intel-powered Macs, restart it while holding down Shift + Option/Alt + Command + R to enter Internet Recovery Mode (make sure you are connected to the internet). 
3. Choose the Reinstall macOS option.
4. Click Install.

This may allow you to install the operating system that your Mac shipped with. Unfortunately, when we tried this method we were unable to recover an older version of macOS, it seems that it works only for some Macs.

How to avoid problems when you downgrade macOS

Reversing an upgrade carries with it a number of wrinkles and pitfalls.

Most of these are due to changes in file formats and settings between versions of the OS. So, for example, if you create a document or work on a file in a new version, whether it’s a beta or full release, of macOS and then try and open it in an older version, it may not work.

To mitigate this, it’s wise to export any documents you’ve created or worked on in the newer OS in a standard file format. So, for example, you could export documents as RTF files. That way, if the native files don’t survive the reverse upgrade, you’ll be able to re-import the RTF files.

Take screenshots of preferences and settings

Whenever you perform a clean install of macOS, which is what you’re doing here, it’s a good idea to take screenshots of any custom settings you’ve created in apps or in System Settings (or System Preferences on older Macs). That makes it easier to re-create them later.

You should also make a note of user account and password details for anything you’ve set up while running the new version of the OS. If you don’t use iCloud or Chrome to synchronise bookmarks, it’s a good idea to export those and make a copy.

And unless you’re using the migrate data option outlined above, you’ll also need installers and license codes for apps you use. If those are downloads from the Mac App Store, you can just re-download them from the Purchased section in the App Store. If not, make sure you can download them from the vendor’s website. If you don’t use a password manager to store license codes, make sure you’ve got a copy of them before you start.

Synchronize

If you use Dropbox, OneDrive, Google Drive or any other form of cloud storage, make sure your data is in sync before you start the process of reversing an upgrade. It’s easy to forget that the files that live in your Dropbox folder, for example, are local files and that while synchronization is frequent, the loss of an internet connection will prevent it and you could have files in your local folder that haven’t yet been copied to the cloud.

Clicking on the cloud service’s logo in your menu bar should tell you whether synchronization completed successfully and files are up to date.

If you use Gmail, iCloud mail or any other IMAP server for your email, make sure it’s up to date and any drafts you’ve composed recently have been synchronized. If you use a POP3 account you’ll have to manually back up the mail database and restore it after you reverse the upgrade. Or, if you only have a few messages you need to keep, forward them to a Gmail account – you could set one up especially for that purpose.