![]() ![]() Many files and apps work well by manually migrating, but the official tool will want to force you to upgrade to the version that made the backup if you ask it to migrate data to an older OS build or version. Select your startup volume and click First Aid. When the main Utilities window appears, select Disk Utility and continue. This will boot the latest version of Recovery Mode over the Internet, which will offer to install macOS High Sierra. Release the keys when a spinning globe appears. ![]() This is not a downgrade, you erase everything and walk away from an easy migration of a newer backup to a clean installation of an older OS. Hold down Option-Command-R as you turn on or restart your Mac. Hold Shift-Option-⌘-R to get the original version (or the closest newer version past what was original if the original is no longer available from Apple content delivery network that powers Internet Recovery. To download the full installer of MacOS High Sierra 10.13.6, then the syntax would be as follows: softwareupdate -fetch-full-installer -full-installer-version 10.13. Apple does ship newer hardware within the same marketing name from time to time, so contact Apple Support if you need to know the version of the OS that shipped with a specific serial number. If you don’t have a record of the OS that shipped, you can make a backup, erase the hard drive and then use Internet Recovery to ask for the proper version that shipped with your serial number. The USB installer will appear as one of the choices to boot from.Īpple documents the things to check if you ever manage to install or bring an older OS to newer hardware where driver support isn’t complete or even available: Once step 2 completes, you can boot from the USB installer by restarting the Mac and immediately hold down the option key until the Startup Manager icons appear. sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Choose the following options.Įnter the following command in a Terminal application window. Use the Disk Utility application to erase the flash drive. The instructions for creating the USB installer can be found at the Apple website How to create a bootable installer for macOS. The installer will appear in the Applications folder, as shown in image below. When finished downloading, you will get the popup message shown below. Note: A clean install of macOS Sierra on the startup drive completely erases all data on that drive including all your files (documents, music, movies, pictures, and even apps).So, If you skip this step, you won’t be able to recover your data if something goes wrong. ![]() The download will appear as a software update, as shown in the image below. High Sierra appears in the App Store as shown in the image below. When it is done, backup the disk image to your online/local backup.High Sierra can be downloaded from Mojave by selecting Get macOS High Sierra on the Apple website How to upgrade to macOS High Sierra. Select Save the home folder in a disk image and Click Delete User. Access System Preferences→Users
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