When you have prepared your USB flash drive and the macOS Sierra Installer is downloaded from the App Store ► open Terminal and type command: The createinstallmedia is a command line tool, which allows users to simply create installation drive, distributed with macOS Sierra installer. How to create macOS Sierra installation USB flash drive with createinstallmedia tool The minimal capacity of USB drive must be of at least 8 GB. If you did not already, you will have to format the USB drive with GUID Partition Table scheme selected and name it as Untitled. Prepare a USB flash drive with the Apple Disk Utility.
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