Fix for 10.12 createinstallmedia "not a valid volume mount point" error

The createinstallmedia command is broken in the currently available (as of May 2022) version of macOS 10.12 and following Apple's own guidance on creating USB installation media will result in the error "not a valid volume mount point".

Here's how to fix it in Terminal.

sudo plutil -replace CFBundleShortVersionString -string "12.6.03" /Applications/Install\ macOS\ Sierra.app/Contents/Info.plist

The command

sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ Sierra.app

will now work correctly.

Posted on May 19, 2022 3:51 AM

Fix for 10.12 createinstallmedia "not a valid volume mount point" error

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