How to downgrade macOS?

Apple makes it pain-free to update Macs to the latest version of macOS. Better still, these updates are free. The newest macOS version, Big Sur, is one of the most feature-packed versions on record offer a nice mix of new and updated tools. Despite this, there are a few reasons you might have no choice but to downgrade to a previous macOS version.

Whatever the reason, downgrading your Mac to a previous version of macOS is possible although it’s not nearly as simple as the upgrade process. Despite months of testing, no operating system version is completely free of bugs. It also takes time for outside app developers to make the necessary changes to support the new version fully. These are two reasons some like to delay upgrading their machines until a bug fix (or two) is released.

Backup your files

If you’ve decided to downgrade, be sure to back up your Mac’s files. Ideally, you should already be backing up your computer regularly either through Time Machine or another solution. Before moving forward, make one final backup copy. This copy probably won’t be used, but it’s good to have in case something goes wrong during downgrading.

Decide how to downgrade

• 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. Otherwise, a downgrade using Time Machine is not an option.
• Third-party solutions such as Carbon Copy Cloner work much in the same way. But again, you need a copy of your files taken before you updated to macOS Big Sur for this to work.
• Using an external USB or another type of drive to downgrade is the best choice when you don’t have backup files. In this case, you’d start from scratch with a new copy of macOS.

Downgrading using Time Machine

• To use Time Machine and take your Mac back to another macOS version, use the following steps. This process involves using the ‘Command’ + ‘R’ command, which works differently on Intel-based machines than those with Apple silicone. And yet, Apple silicone doesn’t support macOS versions older than Big Sur, so the difference is irrelevant here.
• To downgrade macOS via Time Machine, plug your Time Machine backup drive into your Mac, then restart the computer. As soon as the screen goes dark, hold down the ‘Command’ + ‘R’ keys until the Apple logo appears. Next, choose the option, ‘Restore From Time Machine Backup’ and click ‘Continue’. You’ll need to click ‘Continue’ one more time.
• Next, choose your ‘Restore Source,’ which will be the name of your external device. On the list, pick the last backup made in a previous version of macOS. In this case, it would be the final version of macOS Catalina.
• Once the restore process is complete, you can use Time Machine backup to restore individual files as necessary.

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