12/27/2021

Sierra Bootable Installer

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Before you try to use a bootable installer to downgrade your Mac if you have a 2018 or newer MacBook Pro, MacBook Air, or Mac mini, you may need to make sure to allow booting from external media before you attempt to downgrade. If you've enabled the Startup Security Utility, check to make sure you'll be able to use a bootable external drive.

This is the official macOS Sierra Installer from the Mac App Store. Un-archive the zip and you will get the.app for installing Sierra. A bootable ISO or bootable USB can be made from this installer. First the disk will be deleted, then the entire installer will be copied to your disk. The process will take a while, but when it’s done you’ll have a bootable drive with the installer. Notice that the Utilities folder, offered by DiskMaker X, is not here. The command above is specifically for High Sierra (and a disk named “Installer.”). Sep 26, 2016 Creating a bootable USB installer for macOS Sierra. Follow these steps to create a bootable USB installer. Insert the USB flash drive into a USB port and note the volume name of the drive as it.

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

What you need to create a bootable installer

  • A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage
  • A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan

Download macOS

  • Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
    These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
  • Download: OS X El Capitan
    This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

  1. Connect the USB flash drive or other volume that you're using for the bootable installer.
  2. Open Terminal, which is in the Utilities folder of your Applications folder.
  3. Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.

Big Sur:*

Catalina:*

Mojave:*

High Sierra:*

El Capitan:

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.


After typing the command:

  1. Press Return to enter the command.
  2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
  4. After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
  5. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.

Use the bootable installer

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
  3. Select the volume containing the bootable installer, then click Continue.
  4. When the macOS installer opens, follow the onscreen instructions.

Intel processor

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
  3. Release the Option key when you see a dark screen showing your bootable volumes.
  4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
    If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media.
  5. Choose your language, if prompted.
  6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.

For information about the createinstallmedia command and the arguments you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:

A bootable installer is a special type of media that can be used to reinstall operating system or fix system issues that never be solved in usual way. When there is something with your Mac, or you urgently need to upgrade your Mac to the latest version of macOS, a bootable installer could be a great help.

Bootable

This tutorial tells you how to easily create a bootable installer for macOS on both Windows and Mac.

Before getting started, you should know there is only two types of installation media for macOS. One is the official macOS installation app, which is only available from Mac App Store. The other is macOS dmg file, which is made by third-party developers or system administrators.

Part 1. Create a Bootable Installer for macOS on Mac

macOS is the native operating system for all Mac computers. And Apple provides an official tool to create bootable USB installer from macOS installation app with the help of Terminal command, which is totally free. In addition, it is also possible to make a bootable macOS installer from DMG file. We will show examples for both tactics.

Create a Bootable Installer for macOS with Official App

This is the most reliable way to make bootable macOS installer on Mac as it is backed by Apple. It is completely free and no need to download additional software for this purpose.

First, download macOS from Mac App Store. Just launch App Store app on your Mac and search for the macOS name. However, only the most recent versions are available for download, including Big Sur, Catalina, Mojave and High Sierra. After that, click the Get button (Big Sur as example) to download the installation app on your Mac.

The downloading process will take more than 15 minutes as the file size is pretty big (Over 8GB). When it is completed, you will see a Install macOS [version name] app in Application folder.

Now, insert an USB drive into Mac. If everything goes fine, you will see the drive name in left sidebar of Finder app. Then, open Terminal app and type the following command to find the actual volume name of USB drive, which will be used in next step: ls /Volumes/

In above example, the volume name of my USB drive is Big Sur.

Finally, copy one of the following commands to Terminal and change the volume name. Click Enter to start creating a bootable installer for macOS.

Big Sur: sudo /Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/Big Sur

Catalina: sudo /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Big Sur

Mojave: sudo /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/Big Sur

High Sierra: sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Big Sur

You have to wait at least 10 minutes for the above task to be finished. After that, you can use the bootable USB installer for macOS reinstallation, downgrade or upgrade.

Create a Bootable Installer for macOS without Terminal

If you are scared of using text commands in Terminal, please don't worry. There are still two free GUI app available for this task. One is MDS and the other is Disk Marker X. We will go with MDS first.

MDS is popular Mac deploying tool developed by Twocanoes. It can help you set up Mac, download macOS, create bootable macOS installer, install macOS and configure macOS in just a few seconds. Most importantly, it is built upon a modern graphics user interface, making it super easy to use.

First, download MDS from this link and install the app on your Mac. Once loaded, navigate the left sidebar and find go to Download macOS, where you can download the desired macOS. Currently available versions are Big Sur, Catalina, Mojave and High Serria.

After download, please move to Create macOS Installer section. Please select the macOS installer you just downloaded and a target USB drive. Finally, click the Create button to begin making a bootable USB installer for macOS.

Disk Marker X is another free app with the sole purpose for creating a bootable macOS disk. It has been available since Mac OS X Lion (10.7) so it is very popular and reputable solution. The only drawback is that it does not support macOS Big Sur. You can create bootable installer from the following OS candidates.:

Bootable
  • macOS Catalina (10.15)
  • macOSMojave (10.14)
  • macOSHigh Sierra (10.13)
  • macOSSierra (10.12)
  • OS X EI Capitan (10.11)
  • OS X Yosemite (10.10)
  • OS X Mavericks (10.9)
  • OS X Mountain Lion (10.8)
  • OS X Lion (10.7)

The steps are also quite simple. First, download a macOS installation app and open Disk Maker X. Next, select the location of macOS install app and pick up the drive name. Confirm the operation as it will erase the whole disk. Finally, click Erase then create the disk button to start the process.

Create a Bootable Installer for macOS from DMG File

In case, you are unable to download the official macOS installation app, an alternative choice is to make a bootable installer from macOS dmg file, where you can find them on this website or other places on Internet. The software to be used is called UUByte DMG Editor, which works on both Windows and macOS platforms. The details steps will be shown in next section.

Part 2. Create a Bootable Installer for macOS on Windows 10/8/7

Windows, even Windows 10 does not add support for dealing with macOS installation app, which is working on macOS only. If you are on a Windows computer and search for a way to create bootable installer for macOS, the only option is by using macOS DMG file.

So in the coming section, we will demonstrate on how to create a bootable installer for macOS from dmg file on a Windows 10 PC. The steps are the same on Windows 8 and Windows 7. The software we are going to use is UUByte DMG Editor, a cross-platform app that runs well on Windows and Mac.

Step 1: Download a macOS DMG file. These are download links of macOS DMG file, such as Big Sur, Catalina, Mojave, High Sierra, and EI Capitan. For old Mac OS X versions, please download it from Internet.

Step 2: Install DMG Editor on a Windows computer and open it after installation. Now, plug a USB disk into Windows and click Burn button from the main screen. Make sure eject other USB storage devices at the same time.

Step 3: Click the Browse button to locate the macOS dmg file you have downloaded and select the USB drive name in below column.

Step 4: Finally, click the Start button to create a bootable installer for macOS on Windows 10.

Step 5: For a fast USB 3.0 drive, you need to only wait a couple of minutes. For slow USB 2.0 drive, you should wait more than 20 minutes. Please be noted! You will see a notice on screen when the burning process is completed.

There are few tools that are capable of creating macOS bootable USB on a Windows machine. For this task, UUByte DMG Editor is good to go!

Part 3: Install macOS on Mac from Bootable Installer

Eject the USB from Windows 10 computer and plug it into your Mac. Reboot your Mac and keep pressing the Option key at startup to bring up the boot manager. Pick up the drive name and boot up from external USB. After that, follow the screen prompt to start installing macOS from USB on target Mac.

Closing Words

Osx High Sierra Bootable Installer

The above is a complete tutorial for creating a bootable installer for macOS on Windows and Mac. It covers all the details and being verified on four different computers (MacBook Pro, iMac, Windows 10 PC and Windows 7 Laptop). Please go ahead and pick up the best method for you.

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