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Create a macOS Sierra USB Installer from Scratch

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Introduction

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In this step-by-step guide, we will walk you through the process of creating a bootable USB installer for macOS Sierra using just your existing Mac and no third-party software. This method assumes that you have already downloaded the necessary files.

Prerequisites:

- A working Mac (macOS 10.11 or later)

- An empty USB drive with at least 8 GB of free space

Step 1: Downloading macOS Sierra

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To begin, connect your Mac to a stable internet connection and launch the App Store from the dock or Spotlight.

Once open, click on 'Updates' in the left-hand sidebar. If prompted by an update for Xcode, proceed with installing it as it is required for downloading macOS Sierra.

After updating (this may take several minutes depending on your internet speed), navigate to the 'MacOS' section and locate 'macOS High Sierra'. Clicking on this should prompt a new window asking if you would like to download and install. Select both options and click 'Continue'.

Step 2: Downloading Bootable USB Creator

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Once the download process is complete, launch Terminal by searching for it in Spotlight or via Applications > Utilities.

In Terminal, navigate to your downloads folder using `cd Downloads`. Then run this command:

`./BootUSB.dmg`

Follow any prompts that appear and wait until you see a new icon on your desktop labeled 'Boot USB'. Double-clicking this will launch the Bootable USB Creator app.

Step 3: Creating Your Bootable macOS Sierra USB Installer

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In the main window of Bootable USB Creator, select your empty USB drive from the dropdown menu at the top-left corner. Make sure that it is not currently in use!

With your USB drive selected, click 'Start' to begin the process of creating a bootable installer for macOS High Sierra.

Once complete, you will have successfully created a bootable USB version of macOS High Sierra using just Terminal and no third-party software on any Mac running macOS 10.11 or later.

Troubleshooting Tips

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- Make sure your USB drive is empty before attempting to create the installer.

- Ensure that your USB drive has at least 8 GB of free space available.

- If you encounter errors during the creation process, try restarting both your computer and Bootable USB Creator.

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In conclusion, we hope this step-by-step guide has been helpful in creating a bootable macOS Sierra USB Installer from scratch using just Terminal on any Mac running macOS High Sierra or later.

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