![]() To create a bootable installer for macOS Sierra, use this command when you reach step 3 in the linked Apple Support article: When the erase is finished, quit Disk Utility and reinstall macOS Sierra.Select the Apple SSD entry and click Erase.In Disk Utility, select View -> Show All Devices.When the list of utilities appears, select Disk Utility and click Continue. ![]() If your Mac shipped with macOS High Sierra or later: Unfortunately, your Mac likely doesn't support macOS Sierra.Use the command at the bottom of this reply when needed. If your Mac shipped with OS X El Capitan or earlier: You will likely need to create a bootable installer for macOS Sierra using a working Mac.You will need to connect to a Wi-Fi network when prompted. Release the keys when a spinning globe appears. If your Mac shipped with macOS Sierra: hold down Shift-Option-Command-R as you power on or restart your Mac.Start up in macOS Recovery for macOS Sierra:. ![]() To format your drive as Mac OS Extended (Journaled): For context, your previous volumes (Macintosh HD and Macintosh HD - Data) were APFS volumes, inside an APFS Container (partition). To reinstall macOS Sierra, you will need to format (erase) your internal drive as Mac OS Extended (Journaled), since macOS Sierra doesn't support starting up from an APFS container. If you left it behind and installed macOS High Sierra or later, that would have left all of the previous data behind. You were correct to delete the Macintosh HD - Data volume.
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