![]() Quit the installer if it opens automatically after downloading. Download the macOS installer from the Mac App Store.Go to Apple’s CreateInstallMedia support page for up to date instructions.Use the ‘createinstallmedia’ command in Terminal ![]() I tried using Apple’s CreateInstallMedia instructions, and finally was able to create a working Install device and Utility drive per my additional instructions below. After letting Diskmaker X do it’s thing, the drives (when I try using the whole drive as the installer) and partitions (how I normally do it) are not seen by Mac OS as bootable in the “Startup Disk” System Preference or when holding down the Option key on boot/restart. ![]()
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