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This is basically a variation of converting an installer to ISO as discussed here, which you may have some familiarity with already. Mv ~/Desktop/MacBigSur.cdr ~/Desktop/BigSur.isoĪssuming you completed the steps properly, you should now have an ISO file called MacBigSur.iso on the Mac desktop. Finally, we change the file extension from.Hdiutil convert /tmp/MacBigSur.dmg -format UDTO -o ~/Desktop/MacBigSur.cdr ![]() Next, we’ll convert the freshly created MacOS Installer disk image file to a CDR / ISO file that will appear on the desktop:.When finished, we then unmount the disk image volume: Hit return and enter the admin password to authenticate, let this process complete as it makes the installer that will turn into the ISO.Sudo /Applications/Install\ macOS\ Big\ Sur/Contents/Resources/createinstallmedia -volume /Volumes/MacBigSur -nointeraction Now we’ll use the createinstallmedia utility that is part of the MacOS Installer application to copy the installer files to the disk image you just created:.Hdiutil attach /tmp/MacBigSur.dmg -noverify -mountpoint /Volumes/MacBigSur Hdiutil create -o /tmp/MacBigSur -size 12500m -volname MacBigSur -layout SPUD -fs HFS J First, we must create a temporary disk image:.Next launch the Terminal application by hitting Command Spacebar and typing “Terminal” and hitting the return key, or by launching it directly from the Utilities folder.The MacOS installer app should be in the /Applications folder and be labeled as “Install macOS Big Sur.app” or similar, keep it there and make note of the file name. ![]()
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