Written by
Connie YangSummary: This guide tells how to downgrade Mac OS from Sequoia to Sonoma or an older version in reliable and stepwise methods. If you've accidentally lost files after a macOS downgrade, free download iBoysoft Data Recovery for Mac to get them back.
If you regretted upgrading macOS because of its massive changes and macOS Sequoia problems, uninstalling macOS will eliminate your annoyance and bring you a fluency experience.
That brings the question: "Can I downgrade macOS?". The answer is definitely YES. This article gives you three ways to downgrade macOS to an earlier without losing data, even if you don't have a time machine backup.
It is worth mentioning that the ways in this article are also suitable for downgrading Mac OS of any version, such as downgrading macOS from Sequoia to Sonoma, from Sonoma to Ventura, from Ventura to Monetery, from Monterey to Big Sur, or an older version of macOS.
Back up your Mac first!
The macOS downgrading process will erase all data on your Mac. Thus, you need to back up your Mac in advance.
If you only have a few files, copy them to an external drive as a backup. If you want to back up all data on your Mac, you can synchronize it to your iCloud if there's enough storage space. Or, you can back up your Mac files with Time Machine for restoring after rollback the macOS update.
Notably, macOS reversion will also erase all the passwords you used in the current OS, like passwords for apps and networks.
To save your passwords, you can check in Keychain in iCloud when using it to back up data. Or write down all the accounts and corresponding passwords.
Erase your Mac (Necessary)
After you've backed up your Mac, it's time to wipe all data on your Mac hard drive.
This step is necessary. Why? Because erasing your Mac hard drive is to make room for the older macOS you'll install. If you don't wipe the Mac hard drive, you'll face issues like:
- macOS Sonoma downgrading failure
- Sluggish performance of your Mac after macOS reversion
- The volume cannot be downgraded
Usually, the startup volume erasure task should be taken in macOS Recovery mode. Here's how:
- Restart your Mac and press and hold the Command + Option + Shift + R keys until the Apple logo appears (or the spinning globe) to boot into macOS Recovery mode. How to Fix Mac Recovery Mode Not Working
- Select Disk Utility. Then, right-click the macOS-Data volume and click Delete APFS Volume.
- Choose the macOS volume and click Erase.
- Set a name, choose APFS in the Format: box, and then click Erase.
The erasing process will take a while, don't do any other operation during the process, or the internal hard drive may be damaged.
Note: After backing up your Mac and erasing your Mac, you can get down to downgrade from macOS Sonoma to Ventura or from Ventura to Monterey by one of the following methods. It's up to your situation and preference.
Downgrade Mac OS with a Time Machine backup
If you've backed up your Mac with Time Machine before upgrading to the current macOS version, the macOS downgrade work will become very easy. That's because the backup contains your original macOS installer files.
After the Macintosh HD is erased in macOS Recovery, choose Disk Utility > Quit Disk Utility to return to the macOS Utilities screen.
Then, you can follow the steps to downgrade Mac OS from Sequoia to Sonoma or another version of macOS:
- Connect your backup drive to your Mac.
- Select Restore From Time Machine Backup in the macOS Utilities screen and click Continue.
- Select the backup disk and click Continue.
- Choose the destination (typically your Mac's internal hard drive) to save your Time Machine backup.
- Click Restore to retrieve the backup (including the macOS you want to downgrade to and your personal data).
The restoring process will take some time. You can watch TV till the process is done. Then, your Mac mini or another model will automatically restart running macOS Ventura or the other macOS you've rolled back.
Downgrade Mac OS using 'Reinstall macOS' in Recovery Mode
However, if you have no Time Machine backup, how to downgrade macOS Sequoia or another version?
You can boot your Mac into Recovery Mode and use the Reinstall macOS utility to revert to the earlier macOS. This method is suitable for any Mac model at any age to downgrade macOS Sonoma without a Time Machine backup.
There's one thing you should pay attention to - check if the macOS you want to downgrade to like Sonoma is initially shipped with your Mac.
If yes, please follow these steps to downgrade macOS:
- Connect your Mac to the network and restart your Mac while holding Shift + Option + Command + R keys.
- Release the keys until you see the spinning globe.
- Select the Reinstall macOS option in the macOS Utilities window.
- Follow the instructions to install macOS Catalina.
Note: If you have an Apple M1 Mac, you can't revert it from macOS Big Sur to Catalina or another earlier version of macOS because Big Sur was delivered originally.
If you're uncertain about the macOS version your Mac shipped with; or your Mac came with the macOS that is older than the version of macOS you want to downgrade to, you need to follow the above steps to downgrade your Mac to the shipped macOS first.
Then, upgrade the Mac to macOS Sonoma or any version of macOS you want.
- Click the Apple logo and select Mac App Store.
- Download macOS Catalina installation files from App Store. (You can also search for other macOS versions from apps.apple.com and download the desired one from the App Store.)
- Follow the on-screen instructions to install your desired macOS.
If you think this way to downgrade macOS Sonoma is useful, share it with others.
Downgrade Mac OS with a bootable installer
If you have some trouble with the above two ways, you can try to downgrade macOS Sequoia, Sonoma, Ventura, Monterey, or Big Sur by creating a bootable installer.
Step 1: Change security settings
As a Mac with an Apple T2 security chip doesn't allow starting up from an external drive by default, you should alter the security setting before creating the bootable installer.
- Check if your Mac with Apple T2 chip in the Apple menu > About This Mac.
- If it has, boot into macOS Recovery mode.
- Select Utilities > Startup Security Utility.
- Check "Allow booting from external media."
Step 2: Create a macOS bootable installer
Then, restart your Mac, and go ahead to create a bootable installer.
Note: If you had erased your Mac when trying the above two ways to downgrade from Sequoia or Sonoma, you need to create the bootable installer on another healthy Mac.
- Prepare an external drive with no less than 32GB in size.
- Erase the external hard drive to APFS in the Disk Utility app (If it is, you can skip this step).
- Download the installer of your wanted macOS version from the App Store. (Don't allow the installation process to start at this time).
Warning: The Mac operating system download process will take a while. During the process, confirm that your monitor is on, the internet is connected, and the Mac is charged. - Connect your APFS formatted external drive to your Mac.
- Open Finder > Applications > Utilities > Terminal.
- Enter the following command and press Return. Here "MyVolume" in the command means where the macOS installation files will be stored, replace "MyVolume" with the name of your external hard drive. sudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolumesudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolumesudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolumesudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
- Type your admin password when asked and press Return.
- Enter Y when warning you that it will erase the external hard drive and press Return.
- Wait until see the "Copy complete and Done" notification.
Now, you have created a macOS bootable installer.
Step 3: Use the bootable installer to reinstall the earlier macOS version
Please confirm the internet connection is okay. Then, follow these steps to use the bootable installer to reinstall macOS Sonoma, Venrura, Monterey or other version on your Mac.
- Restart your Mac while holding the Option key until you see the list of startup disk options.
- Choose the disk with your target macOS installer and click Restart.
Then, wait for your MacBook Air or MacBook Pro to reboot from macOS Sonoma or another version of macOS.
Restore your data after downgrading Mac OS
After downgrading from Sequoia to Sonoma or from Sonoma to Ventura, the last step is restoring data from the backup you've taken just now.
If you saved the necessary files or folders on an external hard drive, move them to your Mac.
Or, if you have backed up your Mac with Time Machine, you can use the Time Machine backup to restore your Mac with the help of Migration Assistant.
Here's how:
- Connect your external hard drive that contains the Time Machine backup to your Mac.
- Open Finder > Applications > Utilities > Migration Assistant.
- Click Continue and you may be asked to enter your admin password.
- Select From a Mac, Time Machine backup, or startup disk and click Continue.
- Select the drive that includes your backups and click Continue.
- Choose the latest backup that contains files before downgrading to Catalina and click Continue.
- Check in the information you want to transfer to the Mac. Remember to uncheck the System & Network option to avoid restoring the macOS Sequoia or Sonoma files, which will make your Mac back to macOS Sequoia or Sonoma.
However, if your backup hard drive is lost or not working, you can get help from iBoysoft Data Recovery for Mac. This Mac Data Recovery focuses on recovering lost files, documents, folders, etc.
How to avoid Mac OS downgrading failure
Reversing macOS is a complicated task. If one of the steps to downgrade macOS goes wrong, you'll fail to roll back to the previous macOS version you want.
Here are some tips to avoid macOS reversion failure:
Remember to erase your Mac. Once you've backed up your Mac, go to macOS Recovery to erase the Macintosh HD or macOS volume where your current macOS stores. Besides, delete the Macintosh HD - Data or macOS - Data volume to completely clean up your startup disk and make room for the upcoming older macOS.
Keep your Mac connected to the power when downgrading macOS. When your Mac is reinstalling the older macOS, a power outage will cause the macOS installer to corrupt and consequently, Mac OS downgrading failure. You should keep your Mac being charged until the process is done.
Follow every step for downgrading macOS carefully. Whatever the way you choose to downgrade macOS, please follow every step carefully and do not arbitrarily change the order of the steps.
Final thoughts
As we know, downgrading Mac OS is not an easy task and will cause data loss. However, this post offers a complete guide to downgrading macOS Sequoia, Sonoma or earlier in steps, enabling you to have the biggest chance to go back to an earlier macOS version without data loss.
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