Sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ macOS\ Sierra.app 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. Also, it is advised to make a time machine back up of your computer if possible before following the procedure. If your Mac shipped with macOS Sierra: hold down Shift-Option-Command-R as you power on or restart your Mac. To reinstall your Macs OS without an installation disc you need to firstly make sure that you keep your Mac turned on during the whole procedure, and that your Mac is connected to the internet.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). Format: Mac OS Extended (Journaled) Scheme: GUID Partition Table/Map. Choose these options, then click Erase: Name: Macintosh HD. Select the Apple SSD entry and click Erase.
Reinstall OS X: Select Reinstall OS X and click on the Install button. the Erase button and wait until the process has completed. the Security button and set the Zero Data option to one-pass. In Disk Utility, select View -> Show All Devices. Set the format type to Mac OS Extended (Journaled.) Optionally, click on. Make sure your computer is in U Utilities > Disk Utility > select the HD> click on Erase> choose Mac OS Extended (Journaled) > GUID from the Partition Scheme > wait until Erase is finished, and install. 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. When the list of utilities appears, select Disk Utility and click Continue. Alternatively, boot Internet Recovery Mode by holding option R, which can be found on the hard drive under booted. 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.