Chapter in this post:
Did you have too many problems, errors and failures after upgrading your Apple Mac to macOS 10.15? Then it is worth downgrading from macOS Catalina to macOS Mojave. You can find the instructions here so that nothing goes wrong. However, if you have a bootable backup of your Mojave or High Sierra system with you before the Catalina upgrade Carbon Copy Cloner, SuperDuper! or SmartBackup have made, this post is not for you. Then you can simply upload this backup to your Mac and use the Apple computer as before without long instructions;)
Tip: With the app "AnyMacOS"You can easily create a bootable USB stick and the app will even download the appropriate macOS image (from macOS High Sierra) for you.
I got an interesting tip from a reader who has a new 16-inch MacBook Pro. He tried to downgrade it to Mojave and also noticed the matter with the T2 chip, but the Mac keeps throwing an error message. Apple Support then confirmed that new Macs that were already shipped with macOS Catalina AND were only released after Catalina was released can no longer be downgraded to Mojave. But if you are currently buying an iMac model from 2019 that was available BEFORE Catalina, the downgrade should work. With the MBP 16-inch there is no way to "drive" with Mojave.
If you are using a MacBook Pro, MacBook Air or Mac mini from 2018 or 2019, you will need an extra step when downgrading from Catalina to Mojave. Because inside is the T2 security chip, which makes it necessary that you allow a system to be booted from external data carriers before (!) The downgrade. If you are not sure whether your Mac, iMac or MacBook has a T2 chip, look in the system or at Apple in the device details. If available, you proceed as follows:
Since the downgrade process described below will completely remove all your data, files, programs, emails, music, photos, etc. from the hard drive, you have to make a backup now at the latest. It is up to you whether you push everything manually to an external hard drive or use one of the backup programs mentioned above. It is important that nothing is lost for you and that you can transfer everything to the Mojave system that is available after the downgrade. Alternatively, you can also use cloud storage to and from which you can copy your data. The only important thing is that everything else is definitely deleted after the downgrade!
The best way to create a bootable USB stick with macOS Mojave or an SSD with the macOS installer of the 10.14 version is to use it the instructions linked here. There you will not only find the terminal command for the procedure, but also the app alternatives Install Disk Creator and DiskMaker Xwith which you can create the boot stick or the bootable hard drive using a program with a user interface. You can get the Mojave installer, which you also need for this step, here: https://apps.apple.com/de/app/macos-mojave/id1398502828.
Before you can reinstall Mojave, you have to delete Catalina from your Apple Mac. As a reminder: Make sure beforehand that you can boot from an external medium later and that your data is backed up. Also create the boot medium beforehand according to the instructions linked above. All done? Then it continues with these sub-steps:
So if you have decided on macOS 10.14 Mojave as a new installation, you should have selected APFS as the file system when formatting the hard disk. Before I get to the installation instructions, here is a note for everyone whose Mac came with Mojave as the factory operating system: When you turn it on, you just need to press Shift + Alt + Command + R to reinstall Mojave. Thanks to Shift + Option + cmd + R (alternative names), the factory macOS is downloaded and installed again. If your Mac is older than Mojave, here are the instructions for installing it:
If you have an earlier Time Machine backup from Mojave (not Catalina!), You should upload it now to apply your favorite settings directly. Alternatively, you have to set everything up again by hand. In addition, you can then copy your previously saved files, programs, photos, music, etc. back to the hard drive. For the mentioned Time Machine Backup you proceed as follows:
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Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.