To do this, first, you need a USB flash drive with at least 16 GB of memory. Things could be a little bit complex nowbecause you are required to create a bootable installer. You can go to Utilities at the menu bar, then Startup Security Utility and click Allow booting from external media.
You will need to allow the Mac to boot from the external drive first in macOS Recovery mode. And the T2 chip will prevent your computer from booting from a non-Apple-trusted external drive. These Macs are equipped with Apple T2 Security chip. iMac Pro, or a 2018 or newer MacBook Pro, MacBook Air or Mac mini. Solution 4: Create a bootable installerīefore reading: This method requires additional operationsforthe following Mac computers. If you don't have a Time Machine backup nor anAPFS snapshot you want to restore to, the last option is to use a macOS Mojave installer.
Therefore, when you update from macOS Mojave to macOS Catalina, there should be a snapshot of the status of Mojave's APFS file system.
It will automatically take a snapshot of the status of the APFS file system when you upgrade to a new macOS. If you didn't use Time Machine to back up before upgrade, is there a way to downgrade from macOS 10.15 without Time Machinebackup? Yes! Solution 3: Downgrade macOS using APFS SnapshotĪpple File System comes with the snapshot feature. The process may take a while, once it's done the Mac should be downgraded to the earlier version. Your Mac will now restore to this backup.Choose the backup from the backup list that you want to restore in macOS.On the Restore from Time Machinescreen, click Continue.Select Restore from Time Machine Backup in macOS Utilities andclick Continue.Release these keys as soon as you see the Apple logo. Restart your Mac and immediately hold Command and R keys.Connect your Time Machine backup drive with the Mac.If you have used Time Machine to back up your previous macOS before upgrading to macOS Catalina,it's also easy to reverse a macOS update.Let's get it started. Solution 2: Downgrade macOS using Time Machine Really easy, right? But if your Mac doesn't come with macOSMojave, you can choose the following solutions. When your Mac completes installation and restarts, it should be running macOSMojave. Click Continue and follow the onscreen instructions.Īttention: don't put your Macintosleeporclosethe lid during installation.Select Reinstall macOSin macOS Utilities window.Release the keys when you see an Apple logo, spinning globe, or other startup screen.Restart you Mac, immediately press and hold Shift + Option + Command + R.Those keys will make the Mac to reinstall the macOS that came with your Mac.If the original operating system was macOS Mojave when you bought your Mac, then you can downgrade macOS Catalina to the original macOS Mojave without any difficulty. Solution 1: Use macOS recovery mode to reinstall macOSMojave Read on to find out which way suits your need the best. This post will offer four workable methods to help you downgrade from macOS Catalina to macOS Mojave.
Solutions to downgrade macOS from Catalina to Mojave Now you can move to downgrade macOS Catalina.
The Mac now boots into macOS Recovery mode.
Feeling a little troubled? Don't worry, this post will show you how to downgrade macOS from Catalina to Mojave.ĭowngrading your macOS will wipe all information on your startup drive and reinstall macOS onto it.
There's no designed software to help you downgrade the macOS and it requires special operations. Unfortunately, downgrading the macOS isn't as simple as upgrading it. And chances are you wish to revert to the former Mac operating system, macOS Mojave. For example, many users complain that Mac won't boot after upgrade.