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
Upon completion of the USB formatting, locate Install Mac OS X Mavericks.app (downloaded in step #1 to the Applications folder, by default). Right-click the file and select Show Package Contents.
- 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.
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- Os X Mavericks 10.9 Bootable Dmg File; Os X Mavericks 10.9 Bootable Dmg Download; Oct 23, 2013 This guide deals with 3 ways of making a boot disk from OSX 10.9 Mavericks the first one is the fastest and is done via the Terminal from a new command already in OSX Mavericks called createinstallmedia, the other 2 are older ways when Mavericks was in development and are done with a mixture of.
- I have acquired file from torrent where it has been mentioned that it is from App Store and untouched. My steps: 1) double click dmg file 2) double click osx install mavericks.app 3) click install.
- Installing Niresh’s OS X Mavericks (10.9) Introduction and Prerequisites. Installing Windows 7, 8 or 8.1. Access to both Windows and the Niresh Mavericks USB at the same time. I am not going to cover how to write the DMG file to a USB pen or DVD and instead will just link you to.
Use the 'createinstallmedia' command in Terminal
- Connect the USB flash drive or other volume that you're using for the bootable installer.
- Open Terminal, which is in the Utilities folder of your Applications folder.
- 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
MyVolumein 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:
- Press Return to enter the command.
- When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
- When prompted, type
Yto confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased. - 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.
- 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
- Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
- Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
- Select the volume containing the bootable installer, then click Continue.
- When the macOS installer opens, follow the onscreen instructions.
Intel processor
- Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
- Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
- Release the Option key when you see a dark screen showing your bootable volumes.
- 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. - Choose your language, if prompted.
- 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:
Installing Mavericks inside a virtual machine is fairly easy, but there are a few tricks to be aware of if you’re on a newer Mac. Credit to Natsuki’s post for sharing how to get the Mavericks installer to run on Apple computers with Intel Haswell CPU’s. Natsuki also notes a workaround for Apple computers with ECC RAM that requires the removal of a kernel module from the install image using iesd.
Download and install the latest VirtualBox for OS X hosts from here. We’ll be using VirtualBox so that anybody can follow these steps.
Download the Mavericks Installer App through the App Store.The Mavericks installer is provided for free by Apple for users to upgrade their computers to the latest version of OS X. We’ll be making use of the install image provided by this application to install Mavericks within a virtual machine.
While we’re waiting for the Mavericks Installer to download, lets get started on configuring our new Virtual Machine.
Create a New Virtual Machine
Lets call it “Mavericks”
Lets allocate 2 GB of my host machine’s 8 GB of RAM
Lets create a new blank disk image for this machine
The VDI format should be fine for what we’re doing
A dynamically sized disk should also be fine for what we’re doing
Lets call this disk image “Mavericks” too
And we’re successfully created our virtual machine
We need to check if your computer has an Intel Haswell processor. We’re going to use “About This Mac” to check.
Lets launch “About This Mac”
Click on “More Info…”
If you see “Late 2013” or later, we’ll need to change the CPUID for our virtual machine so the installer image boots
We need to determine the name of the virtual machine, if you called it something other than “Mavericks” you’ll need to use the name you get from this command:VBoxManage list vms
Now that we have the name, we can specify the CPUID for that virtual machine
Run VBoxManage modifyvm Mavericks --cpuidset 00000001 000306a9 00020800 80000201 178bfbff (Substitue Mavericks with what you got from VBoxManage list vms if you have something different)
In your terminal, run sudo gem install iesd
iesd is a Ruby applicaiton with extracts the installer disk image from the installer application to for use as a boot disk for your virtualization software.
Run iesd -i /Applications/Install OS X Mavericks.app -o Mavericks.dmg -t BaseSystem
Now you’ll have a Mavericks.dmg inside your user’s home folder.
Now we’ll attach this disk image to our virtual machine
Click on the “Storage” text of this new machine
Click on the “Empty” list item
Click on the CD icon to “Choose A Virtual CD/DVD Disk File…”
Install Os X Mavericks Dmg
Choose the Mavericks.dmg file that iesd produced in your home folder
Now we’re set to install Mavericks within the VM!
Wait for the VM to boot. You’ll see plenty of black on white text scroll by with some errors and warnings, but they are acceptable.
And we’ve booted!
The mouse will be very laggy on this screen because of the animation, so it may be easier to hit the “Enter” key than to navigate to the next button with the mouse.
Before continuing with the installer, we need to format the blank disk so that the installer detects it as an install location.
Go to “Utilities” -> “Disk Utility…” to launch the Disk Utility
Select the “VBOX” disk and go to the “Erase” tab. Give the disk a better name than “Untitled”, I’m partial to “Mavericks” and then click “Erase”
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Click “Erase” again when prompted
Wait for the disk to be erased. Once it’s ready, the named disk will appear in the top left of Disk Utility.
Quit Disk Utility
Now we’re all set to install Mavericks!
Click “Continue” on the Installer
Agree to the EULA and note the section that permits what we are doing
Select the volume we created with Disk Utility and click Install
It will take a little over 20 minutes for the installer to run
Restarting
We’ve successfully installed Mavericks. Lets take a snapshot of the machine at this point in case we ever want to reset back to the big bang.
After the Machine restarts, we’re actually going to want to “Power off the machine” so that we can take a snapshot of the virtual disk and detach the install disk
On VirtualBox Manager, click on “Snapshots” for this machine
Click the Camera icon to take a snapshot
Name your snapshot
Snapshot created
Lets not forget to detach the the installer image.
Switch back to the “Details” pane and click on the “Storage” text
Click on the installer image, then the CD icon, and finally “Remove disk from virtual drive”
From here, you’re good to go to start the virtual machine again and continue with the installer. I’d recommend taking another snapshot after you’ve set up the virtual machine so that you have another checkpoint to restore to.
A couple caveats here and also here (under “Mac OS X guests”). There aren’t any Virtualbox Guest Additions for OS X and the default resolution of the machine is 1024×768.
From the VirtualBox documentation, it is possible to set higher resolutions with VBoxManage setextradata 'VM name' VBoxInternal2/EfiGopMode N where N values of 0-5 correspond with 0=640×480, 1=800×600, 2=1024×768, 3=1280×1024, 4=1440×900, 5=1920×1200
Thanks for sticking through this how-to. I hope that this VM image will be useful in testing your OS X applications. Don’t forget to make liberal use of snapshots; and remember that you can create lightweight, snapshot-based clones of this VM if you need more than one.
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You should join me in the comments for discussion of this how-to.