To follow the steps, you'll need an empty 8GB or larger USB thumb drive (USB-C or USB-A, depending on your Mac) and an hour or two of downtime while the installation procedure completes.Īlso, be sure to perform a full backup of your Mac beforehand using Time Machine, so that you can restore your original system from the Recovery partition if something goes wrong. It will also work with the final version of Mojave, once it's released in the fall. The following procedure works with the latest public beta of macOS Mojave, which you can download by enrolling in the Apple Beta Software Program. Performing a clean install can also remove annoying quirks and strange behaviors that your Mac may have inherited over time, and often helps to reclaim disk space caused by junk files left by third-party apps. To ensure that everything goes smoothly, we'll take the extra step of deleting your existing partition before installing macOS.This article guides you through the process of performing a clean installation of macOS 10.14 Mojave using the bootable USB drive method, rather than upgrading your Mac using Apple's standard installation package, which retains existing user data and any user-installed apps.Ĭreating a bootable USB drive provides you with a convenient way to install a fresh copy of macOS Mojave on multiple Macs. Once your installation files have been copied, it's time to install macOS from scratch. Once you hit Enter, you'll need to enter your admin password to approve the command, and then hit "Y" on your keyboard to confirm that you're OK with the contents of the USB drive being overwritten. Here's another example that creates a macOS High Sierra install USB on a drive named "MacOS Installer": sudo /Applications/ Install\ macOS\ High\ Sierra.app/ Contents/Resources/createinstallmedia -volume /Volumes/MacOS\ InstallerĬommand to list all connected volumes, which will include your USB installation medium in case you need to check the label. For example, "Install macOS High Sierra.app" would become Install\ macOS\ High\ Sierra.app Be aware that any spaces will need to be preceded by a backslash. You can change various parts of this command to suit your own circumstances, with the main one being the name of the installer. This assumes that you're installing Big Sur, that your drive is labeled "macos_installer," and that you have the relevant macOS installer in your Applications folder: sudo /Applications/ Install\ macOS\ Big\ Sur.app/ Contents/Resources/createinstallmedia -volume /Volumes/macos_installer Older versions were written for Intel chips, which use the x86_64 instruction set, while the newer Apple Silicon chips use the ARM instruction set. It's common knowledge that new macOS releases often drop support for older hardware, but the same is true for newer Mac models and older software, too.įor example, you cannot install any version of macOS prior to Big Sur (released in 2020) on a Mac with an Apple Silicon chip, including the M1. It's important to understand that not all versions of macOS (or Mac OS X) work with all hardware configurations. While the process is pretty straightforward, getting your hands on older releases of macOS isn't so easy. Got an old Mac and want to reinstall macOS? Maybe you want to roll back your Mac to an earlier version of macOS than the one you currently have installed? Here's how you downgrade macOS to an older version. Where to Download Older Versions of macOS.
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