# Big Sur sudo /Applications/Install \ macOS \ Big \ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume # Monterey sudo /Applications/Install \ macOS \ Monterey.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume # Ventura sudo /Applications/Install \ macOS \ Ventura.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Note that the command is made for USB's formatted with the name MyVolume: Next run the createinstallmedia command provided by Apple (opens new window). Note 3: Users following "Legacy macOS: Online Method" section can skip to Setting up OpenCore's EFI environment.Note 2: By default, Disk Utility only shows partitions – press Cmd/Win+2 to show all devices (alternatively you can press the View button).This will be mounted later when Setting up OpenCore's EFI environment Note 1: The EFI partition created by formatting the USB is hidden until you mount it. This will create two partitions: the main MyVolume and a second called EFI which is used as a boot partition where your firmware will check for boot files. We'll want to use macOS Extended (HFS+) with a GUID partition map. Now we'll be formatting the USB to prep for both the macOS installer and OpenCore. This method allows you to download much older versions of OS X, currently supporting all Intel versions of OS X(10.4 to current) If you want to check the integrity of your download, you can check this repository of checksums (opens new window), although do note that these are crowdsourced checksums and may not be a reliable way to check for authenticity.
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