Can you roll back macOS versions?

There are two ways to downgrade your Mac to a previous version. You can restore through Time Machine or install macOS from a USB. Taking the Time Machine route is the easiest, although this assumes you have a Time Machine backup of your system that pre-dates your installation of macOS Big Sur.

How do I restore my Mac to a previous operating system?

How to revert to an old macOS using Time Machine

1. Start up your Mac and immediately hold down Command + R.
2. Continue holding both keys until you see the Apple logo or a spinning globe.
3. When you see the Utilities window choose Restore from Time Machine Backup and click on Continue.
4. Click Continue again.

How do I downgrade from High Sierra to Sierra without Time Machine?

How to downgrade without a Time Machine backup

1. Plug the new bootable installer into your Mac.
2. Restart your Mac, holding the Alt key and, when you see the option, choose the bootable install disk.
3. Launch Disk Utility, click on the disk with High Sierra on it (the disk, not just the volume) and click the Erase tab.

Can I downgrade macOS High Sierra?

If you’re on High Sierra 10.12. 4 or later, and you want to revert to the version of macOS that shipped with your Mac, then you’re in luck! This is one of the easiest ways to downgrade your Mac: Restart your Mac, while holding down the ‘Shift+Option+Command+R’ keys.

How do I downgrade from High Sierra to Snow Leopard?

If you wish to downgrade to something else older then High Sierra, then you need to download macOS installer file and flash it to usb, then reboot into the macOS installer, holding an “alt/option” key, then run Disk Utility, reformat your hard drive and start the installation.

How do I downgrade from OS X El Capitan to Mavericks?

You can use this approach to downgrade to OS X Mavericks, OS X Yosemite, Mountain Lion, or Lion, directly from OS X El Capitan, assuming you have a backup from one of those versions. This relies on having a recent Time Machine backup made of OS X prior to the Mac updating to OS X El Capitan.

How do I install mountain lion on my computer?

If you have an OS X Mountain Lion restore disc, just insert that and run the installer. When the computer restarts, go into options and choose “Custom Install” and select the erase and install option.

How do I restore my Mac OS X to a previous version?

Just reboot the Mac and hold down Command + R to boot into the restore menu. Then choose the most recent backup with OS 10.8. Another option is to use Apple’s Internet Recovery to reinstall the original version of Mac OS X that came with your computer.