Once the copying has finished we can unmount the temp disk image with the following command. sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/macOS -nointeractionĮnter your password when prompted and wait the files to copy. Use the createinstallmedia utility (located inside the Install macOS Big Sur app) to copy the installer files to the mounted disk image by running the following command. hdiutil attach /tmp/macOS.dmg -noverify -mountpoint /Volumes/macOS Mount the temp disk image with the following command. hdiutil create -o /tmp/macOS -size 12945m -volname macOS -layout SPUD -fs HFS+J Open the Terminal app by pressing Command + Space, searching for “Terminal” then pressing Return.Ĭreate a temp disk image by executing the following command. Once, you’ve downloaded the macOS installer, follow the steps below to create the ISO. Download the Full macOS Big Sur Installer from the Command Line.
In order to create the ISO you need to download the full macOS installer app to your Applications folder.
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