As expected, Apple has started shipping new Macs with macOS 10.15 Catalina. We’re still hesitant to recommend upgrading to Catalina, particularly if you use Mail, since reports of email data loss continue. Luckily, downgrading a new Mac from Catalina to 10.14 Mojave is possible for models other than the 16-inch MacBook Pro and the 2019 Mac Pro. Mac scripting expert (and author of the new book Moving to zsh) Armin Briegel has published a guide explaining how to roll back a new Mac that ships with Catalina to Mojave. Unfortunately, the process to install Mojave isn’t straightforward, requiring a Mojave Installer USB drive. It’s particularly fussy if your Mac is equipped with a T2 security chip since you have to set up an account before you can use Security Utility to enable booting from external drives. Regardless, you will have to erase the internal drive entirely before you can install Mojave due to Catalina’s bifurcated drive structure.
![]() How To Install Mojave Os
It could be related to the Mac OS / Mac OS X installed on or the hard drive space on the Mac that is being used. However, this is only speculation and if you have an exact answer (or theory) as to why some Mac users download the full installer and some the mini-installer, share that with us in the comments. On a computer running OS X Yosemite it is possible to see versions of Mac OS X in the Mac App Store. Yosemite, Mavericks and Mountain Lion can all be seen here. If you prefer to select Mac OS Extended (Journaled), you won't get any system updates. APFS will work on the End 2009 models and later as with High Sierra. If your device doesn't support originally High Sierra (and therefore isn't able do start with APFS), you won't have any recovery partitions and the reboot display will be different.
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December 2020
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