You can get the Mojave installer, which you also need for this step, here. You will not only find that in it Port-Command for the procedure but also the app alternatives Install Disk Creator and DiskMakerXwith which you can create the boot stick or the bootable hard drive using a program with a user interface. 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. Step 2: Create a bootable stick / hard drive with macOS 10.14 Mojave The only important thing is that everything else is definitely deleted after the downgrade! Alternatively, you can also use cloud storage to and from which you can copy your data. 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. It is up to you whether you push everything manually to an external hard drive or use one of the backup programs mentioned above. from the hard drive, you have to make a backup now at the latest. Since the downgrade process described below will completely remove all your data, files, programs, emails, music, photos, etc. Image source: / Update : A reader pointed out to me that in order to install an older system (like macOS Mojave in this case), you also have to select "Medium Security" above. If your Mac from 2018 or 2019 has a T2 Security Chip, you must first specify that the computer can also be booted from external sources. Activated in the upper paragraph "Medium Security".Activate the option "Allow starting from external media" below.Click on the item in the menu bar Utilities and then choose Startup security utility (first point) and give your Administrator login a.Release after booting now you are in Recovery Mode / Recovery mode arrived (you can also recognize it by the fact that the window "macOS utilities" is displayed).Stop right after turning it on cmd + R (or command + R or ⌘ + R) pressed.Turns the Mac off and then back on or off.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. 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 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. ![]() First of all: important step for newer Mac models with T2 chip!
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