Like /Volumes/XYZ is not a valid volume mount point.Īttempting to use Sierra’s createinstallmedia on my macOS Catalina machine Tl dr: In late 2019, Apple published an updated macOS Sierra installer whichīroke the ability to create bootable installation media, failing with an error To hold the installer using createinstallmedia, a quick bit of Googling starts MacOS Sierra on an older Mac, and you want to create a bootable USB flash drive If, like a friend of mine, you find yourself needing to install a fresh copy of Cody krieger Creating bootable macOS Sierra installation media on macOS Catalina
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