Use this Apple Support article to download the InstallMacOS.dmg file.
To install Sierra on a machine that cannot boot, you will need an external USB drive (16GB+). using the links above.
A physical bootable drive provides a reliable mechanism to execute a clean deployment or repair a corrupted local storage drive. Preparing the volume requires a blank flash memory drive with a capacity of . Step 1: Format the Drive Insert your blank flash drive into a functional USB port. download macos 1012 sierra full
Disclaimer: macOS Sierra is an older operating system that no longer receives security patches from Apple. It is recommended only for legacy hardware that cannot support newer versions of macOS.
Higher hardware requirements than its predecessor (El Capitan), lacking modern security patches as of late 2019, and some early bugs like flickering menu bars were reported. How to Download the Full Installer Use this Apple Support article to download the InstallMacOS
Insert a USB flash drive (12GB+ named MyVolume ) and run this command: sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app 4. Important Considerations
Although Sierra is no longer featured, Apple still provides the official installer via the Mac App Store. This is the safest method to get a . A physical bootable drive provides a reliable mechanism
Open and erase the drive using the following parameters:
Look in your folder for a file named Install macOS Sierra.app . Creating a Bootable macOS Sierra USB Installer
: You can now run the app from your Applications folder or use it to create a bootable USB with Terminal.
Click and follow the on-screen instructions to upgrade your system. Method B: Clean Install Using a Bootable USB Shut down your Mac completely. Ensure your bootable USB drive is plugged in.