Oct 13, 2019 Start up your Mac pressing Shift-Option/Alt-Command-R. Once you see the macOS Utilities screen choose the Reinstall macOS option. Click Continue and follow the on-screen instructions. Select your startup disk and click Install. Downgrade from macOS Catalina Beta to macOS Mojave. While the process is the same for all Mac devices, the newer models have an extra setting in the startup utility. Here’s what you should know before getting started! For Newer MacBook After 2018. The MacBook Pro, MacBook Air, and Mac Mini models (2018 or later) are equipped with the new T2 chip.
Summary
If you don't like your new macOS Catalina or current Mojave, you can downgrade the macOS without losing data on your own. You need first backup important Mac data to an external hard drive and then you can apply effective methods offered by EaseUS on this page to downgrade Mac OS. Catalina, Mojave, High Sierra, Sierra, and El Capitan, etc. modern Mac OS X are all supported.
Are you trying to revert or downgrade your new macOS or Mac OS X to the previous version on the Mac computer? If yes, stay here. Just follow the provided guidance below to bring your previous macOS or Mac OS X back without losing any data:
Methods on this page can be applied to all Mac systems including the latest Catalina, Mojave, High Sierra, Sierra, and old Mac OS El Capitan, etc.
Tip: Backup Mac data before downgrading macOS or Mac OS X
It's highly recommended for you to back up all important Mac data first before you start downgrading Mac OS to an older system.
You can either choose third-party Mac backup software to back up Mac data to an external hard drive at once or choose Time Machine to back up all wanted data with ease.
Considering data security, it's also highly recommended for you to backup all important data into an external hard drive.
If you prefer to use Time Machine, here are the details:
Wait for the process to finish. After backing up all data, then you can start downgrade or revert Mac OS with ease. Here, you'll find two methods for you to downgrade Mac OS and you can choose either one as a guide.
Method 1. Downgrade macOS or Mac OS X with Time Machine
So if you have created backups for your Mac data and Mac OS, follow the below steps for a guide. If you haven't created such a backup, please jump to Method 2 to downgrade Mac OS.
Then all you need is to wait for the computer to restore and gain Yosemite again. It will usually take a few hours or all day long, depending on how much data need to be restored.
Method 2. Create USB Boot Drive and Revert Back to Old macOS or Mac OS X
This method is set for users who have no Time Machine backups. And if you have no backups of your current macOS or Mac OS, use Time Machine to back up your important data first and the system first.
Then follow below steps to downgrade Mac OS now: (The ways to download new macOS and old Mac OS X are different. Make sure that you've followed the right guide for downgrading Mac system.)
![]() Downgrade macOS (e.g: Downgrade macOS Mojave to High Sierra)
3. To to Finder and launch Terminal, type: -sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install macOS High Sierra.app and hit Return.
If your Mac is shipped with Mojave, you can directly downgrade Catalina to Mojave with below tips:
By doing so, the old High Sierra will be installed on your Mac automatically.
Downgrade Mac OS X (e.g: Downgrade Mac OS X Yosemite to El Capitan)
Bonus Tip: Restore Lost Data after Downgrading macOS/Mac OS X(without backups)
This method is for users who have forgotten to back up important data before downgrading Mac OS. And if you lost data after Mac OS reinstallation or downgrading, here is the solution - to restore lost data after Mac OS X downgrading or reinstallation with powerful Mac data recovery software.
Downgrade Os Mac
EaseUS Mac data recovery software supports to restore whatever you lost in Mac and it's fully compatible with all Mac OS above 10.8
And if you happen to lost important data after Mac OS downgrading, let EaseUS Data Recovery Wizard for Mac help you out. Three steps will do all jobs.
Step 1. Select the disk location (it can be an internal HDD/SSD or a removable storage device) where you lost data and files. Click the Scan button.
Step 2. EaseUS Data Recovery Wizard for Mac will immediately scan your selected disk volume and display the scanning results on the left pane.
Step 3. In the scan results, select the file(s) and click Recover Now button to have them back.
The OS X El Capitan public beta is a way to test the next generation of Mac software. If it turns out you don't enjoy the process, or would prefer to wait and try again later, you can go back to OS X Yosemite. Downgrading is a simple process, but it's also a bit of a chore. Don't worry, though, we'll walk you through it!
Note: If you're reading this article on the Mac you want to revert, either print it out first, or open it on iPhone, iPad, or another Mac so you can read along as you go.
If you made a bootable OS X Yosemite install drive before you went on the El Capitan beta, then simply plug it in, reboot, hold down the Option key, and you'll be on your way.
If not, you'll need to erase OS X El Capitan first, and then re-install.
How to erase OS X El Capitan
Once it's done, quit Disk Utility and get ready to reinstall.
How to reinstall OS X Yosemite
From this point on it's the same as a standard update, simply continue on and agree to the licensing terms as you go. When you're done, your Mac will reboot into OS X Yosemite.
Note: Depending how old your Mac is, you may get an older version of the installer—typically the one that originally shipped on your Mac (That's especially true if you end up in Internet Recovery mode).
If that happens, complete the installation of Lion, Mountain Lion, Mavericks, or whichever version you're offered, and when you're done and rebooted, go to the Mac App Store and re-run the OS X Yosemite update.
How to restore your data from Time Machine
You should be asked if you want to restore from Time Machine as part of the reinstallation process. If not, or if you choose not to, you can restore at any time.
Your Mac will then restore from Time Machine and reboot. The process can take a while so, depending on network speeds and the amount of data, so be patient.
If you run into any trouble or have any questions, ask away in the comments!
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