If you don’t have a Time Machine backup from before you installed the new version of macOS, and Recovery didn’t offer the option to revert to the original version of macOS your Mac shipped with, your next best option is to download the installer for the version of macOS (or even Mac OS X) you wish to install and use it to create a bootable USB macOS installer so you can install it on your Mac.
As with the other options above, this process will require you to delete everything on your Mac, so make a backup of anything you don’t want to lose-but don’t back up using Time Machine because if you recover files from that you’ll also be recovering the version of macOS you don’t want to use.
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You will need to get your hands on the version of the Mac operating system you want to install. We have a separate article about how to get old version of macOS or Mac OS X, which includes links to where to download each version of macOS, so if you haven’t got the version of the Mac operating system you want pop over there for advice on how to get it.
The most recent are here:
- Ventura
- Monterey
- Big Sur
- Catalina
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Once you have downloaded the installer don’t click to install it-you won’t be able to install an old version of macOS over a new version unless you follow the process to create a bootable USB macOS installer detailed below.
How to install an old macOS using bootable installer
To revert to an older version of macOS this way you need to use a process known as a clean install, which we look at in more detail here: How to do a clean install of macOS. You will be wiping your Mac and installing the version of macOS you require on a clean slate.
- Download the installer of the version of macOS that you require from the Mac App Store. Follow the instructions here.
- Use this installation file to create a bootable installer on an external storage device. Read about creating a bootable installer here.
- Next you need to completely erase everything from your Mac, restoring it to factory settings. The process to do this depends on the version of macOS you are running. Newer macOS versions have an Erase All Content and Settings option that allows you to easily reset your Mac to factory settings. In Somona the option is in System Settings > General > Transfer or Reset, in Monterey you can find Erase All Content and Settings in the System Preferences menu. In older versions of macOS you will have to use Recovery mode and access Disk Utility to erase the Mac. The full instructions for how to wipe a Mac can be found here.
- Once you have erased your Mac, and formatted the drive correctly, you are ready to install the version of macOS from your bootable installer. Start by plugging in the bootable installer that you created using the instructions linked to above.
- Switch off your Mac and start up while holding the following keys: Intel Mac: press and hold Option/Alt until you see a screen showing the bootable volume; M-series Mac: power button to turn on the Mac-but keep it pressed until you see the startup options window including your bootable volume.
- Choose the bootable installer volume.
- Click Continue.
- Follow the onscreen instructions to install macOS.
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