Create Dmg Installer For Mac

  

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.

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What you need to create a bootable installer

  • A USB flash drive or other secondary volume, formatted as Mac OS Extended, with at least 12GB 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 and a gear icon labled Options.
  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

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

  • Big Sur: /Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia
  • Catalina: /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia
  • Mojave: /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia
  • High Sierra: /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia
  • El Capitan: /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia

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.

Mojave is still one of the most popular macOS desktop operating system in late 2020, which occupies around 20% market share of entire macOS. There are still millions of Macs or Hackintosh running Mojave as its primary OS. However, if the computer was crashed or broken, you have to reinstall macOS Mojave on it to solve the problem.

In this post, we will share a detailed tutorial on how to create a macOS Mojave bootable USB installer. At this time, we will use a Windows PC (Windows 10 laptop) as you are unable to get into the Mac. Honestly, it is much easier to create macOS bootable USB on Mac with createinstallmedia command in Terminal. You can refer to Part 6 of this tutorial if you have a Mac to do this.

Part 1: MacOS Mojave Hardware Requirement

If Your Mac was shipped with Mojave in default, then there is no need to check hardware compatibility at this time. For system downgrade or upgrade, you have to make sure your Mac hardware meet the minimal requirement for installing macOS Mojave.

For Mac:

Create Dmg Installer For Mac
  • MacBook Pro (Mid 2012 or newer)
  • MacBook Air (Mid 2012 or newer)
  • MacBook (Early 2015 or newer)
  • Mac mini (Late 2012 or newer)
  • iMac (Late 2012 or newer)
  • iMac Pro (2017)

Create Dmg Installer For Mac Windows 10

However, if you prepared to install macOS Mojave on a Hackintosh, the requirements are different and much complex. You should do your homework more carefully. Below is an overview requirement.

For Hackintosh:

  • CPU: Intel 8th or 9th Generation
  • Memory: 4 GB RAM
  • Storage: 128 GB SSD or HDD.
  • Motherboard: Compabible with CPU (Asus, MSI Preferred)
  • Graphics: AMD Radeon Recommended

Part 2: Download macOS Mojave DMG File

macOS Mojave has two types of installation format. One is via Install Mojave App where you can directly download from Mac App Store. This option is not available on Mac with a new version of macOS that is newer than Mojave.

The other installation media is via Mojave dmg file, which contacts all the files and boot information for installing macOS Mojave in a compressed structure. However, you need to burn dmg to USB first before it is used as a bootable media. Now, you can download macOS Mojave DMG file the following resources:

Download Link 1: https://archive.org/download/macOS_Mojave.dmg

Download Link 2: https://sundryfiles.com/9tz

Part 3: Create macOS Mojave Bootable USB Installer on Windows 10 PC

You have completed the preparation process in above steps and it is time to create a bootable Mojave USB installer from the download dmg file. Unfortunately, the USB would be bootable if just simply copying the dmg file to USB drive without additional actions because the booting code is not written to USB via file copy. Instead, you should use third-party software to help you create a macOS Mojave USB drive from DMG file.

UUByte DMG Editor is such a tool for burning dmg file to USB drive. It will copy all installation files and write boot information to USB drive as well. After burning, the USB is bootable and can be used as a media to install macOS. The following is the details for creating macOS Mojave bootable USB drive.

Step 1: Click the Download button and save the .exe file on your Windows PC; then double click it to start the installation process.

Step 2: Insert a USB drive into the PC and open DMG Editor software from desktop shortcut. Now, click Next button at the right side of Burn module.

Step 3: Now, you need to import the downloaded Mojave dmg file into the program and choose the USB drive name from drop-down menu.

Step 4: When the preparation is done, click Burn button to start burning macOS Mojave dmg file to target USB device. You have to wait for 5-10 minutes for this.

This is one of most reliable ways to create macOS Mojave bootable USB drive on a Windows PC. You can use DMG Editor on latest Windows 10 as well as Windows 8/7/XP.

Part 4: Install macOS Mojave from USB Drive on Mac

After creating macOS Mojave bootable USB drive, it is the right time to install Mojave on your Mac. If possible, make sure taking a backup of important data on your Mac. The installation process will format the drive and this will delete all your personal data and apps from Mac.

To get started, please connect the USB drive to Mac and power on the computer. Keep pressing the Option key and you see the Startup Manager in a few seconds. Click on the USB drive name with your mouse to enter into installation page. Next, select the internal drive and finally click Continue button to begin the installation process.

Note: For installation on a Hackintosh, you need additional tool to configure the boot loader, such as OpenCore or Clover. After that, plug the USB into Hackintosh and set USB as the first boot device in BIOS. By doing this, you will manage to get into Mojave install wizard.

Part 5: Possible Issue and Fix

According to our research, there might be a few issues during this process, which were reported by online users. Below is a list of most common issues you may come across. Please don't be scared as we also share possible fix to help you out!

USB Not Showing up in Startup Manager: If the USB drive burned with DMG Editor did not show up in Startup Manager, it means the burning process failed. The most possible reason is that the dmg file was corrupted, you need to download it from another source and burn it again.

No available drive for installation. Mojave is built with APFS but the old Macs come with HFS or HFS+. You have to boot into macOS Recovery mode and format the drive to APFS with Disk Utility app.

It could be more issues with Hackintosh and we don't have less epxerience on this topic. Please go to Hackintosh blog or forum for more accurate solutions.

Conclusion

Create Dmg Installer For Mac Download

The above are the necessary steps intended to create a macOS Mojave bootable USB on a Windows 10 PC. Please read them carefully, especially the hardware requirement section. You won't be able to install Mojave on a Mac that does not meet its technical specification. You can also send us email if you have issue not being solved by your own.