To ensure that everything goes smoothly, we'll take the extra step of deleting your existing partition before installing macOS. 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. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later 2. OS X Mavericks/Yosemite- System Requirements Macs that can be upgraded to OS X Yosemite 1. It would be preferable to use Ethernet because it is nearly four times faster than wireless. For example, "Install macOS High Sierra.app" would become Install\ macOS\ High\ Sierra.app The file is quite large, over 5 GBs, so allow some time to download. 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. Sudo /Applications/ Install\ macOS\ Big\ Sur.app/ Contents/Resources/createinstallmedia -volume /Volumes/macos_installer We'd recommend test-driving any experimental macOS installations for a while before you commit. As a last resort, you could manually back up your important documents, libraries, and so on to an external drive. You can get around this by using a third-party backup tool like Carbon Copy Cloner or ChronoSync. For example, trying to restore a Time Machine backup made in Big Sur (released in 2020) in macOS Catalina (released in 2019) could prove difficult. Older versions of macOS might experience problems restoring from Time Machine backups made on subsequent releases. If you do decide to try a new version of macOS and you're reliant on Time Machine for your backups, resist backing up with Time Machine until you're sure that it's where you want to stay. This guide can help you roll back to almost any version of macOS. After trying this, you might come to the conclusion that newer releases perform too poorly on your hardware, at which point, you'll need to roll back. If you're willing, you can install newer versions of macOS than your Mac supports with tools like Patched Sur.
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