# Making the installer in macOS
While you don't need a fresh install of macOS to use OpenCore, some users prefer having a fresh slate with their boot manager upgrades.
To start we'll want to grab ourselves a copy of macOS. You can skip this and head to formatting the USB if you're just making a bootable OpenCore stick and not an installer. For everyone else, you can either download macOS from the App Store or with Munki's script.
# Downloading macOS: Modern OS
- This method allows you to download macOS 10.13 and newer, for 10.12 and older see Downloading macOS: Legacy OS
From a macOS machine that meets the requirements of the OS version you want to install, go directly to the App Store and download the desired OS release and continue to Setting up the installer.
For machines that need a specific OS release or can't download from the App Store, you can use the Munki's InstallInstallMacOS utility.
In order to run it, just copy and paste the below command in a terminal window:
mkdir ~/macOS-installer && cd ~/macOS-installer && curl -O https://raw.githubusercontent.com/munki/macadmin-scripts/main/installinstallmacos.py && sudo python installinstallmacos.py
As you can see, we get a nice list of macOS installers. If you need a particular versions of macOS, you can select it by typing the number next to it. For this example we'll choose 10:
- macOS 11, Big Sur Note: As this OS is quite new, there's still some issues with certain systems to resolve. For more information, see here: OpenCore and macOS 11: Big Sur
- For first time users, we recommend macOS 10.15, Catalina
- Nvidia GPU Note: Reminder to verify whether your hardware support newer OSes, see Hardware Limitations
This is going to take a while as we're downloading the entire 8GB+ macOS installer, so it's highly recommended to read the rest of the guide while you wait.
Once finished, you'll find in your
~/macOS-Installer/ folder a DMG containing the macOS Installer, called
Install_macOS_11.1-20C69.dmg for example. Mount it and you'll find the installer application.
- Note: We recommend to move the Install macOS.app into the
/Applicationsfolder, as we'll be executing commands from there.
- Note 2: Running Cmd+Shift+G in Finder will allow you to easily jump to
From here, jump to Setting up the installer to finish your work.
# Downloading macOS: Legacy OS
This method allows you to download much older versions of OS X, currently supporting all Intel versions of OS X(10.4 to current)
# Setting up the installer
Now we'll be formatting the USB to prep for both the macOS installer and OpenCore. We'll want to use macOS Extended (HFS+) with a GUID partition map. This will create two partitions: the main
MyVolume and a second called
EFI which is used as a boot partition where your firmware will check for boot files.
- Note: By default, Disk Utility only shows partitions – press Cmd/Win+2 to show all devices (alternatively you can press the View button)
- Note 2: Users following "Legacy macOS: Online method" section can skip to Setting up OpenCore's EFI environment
Next run the
createinstallmedia command provided by Apple (opens new window). Note that the command is made for USB's formatted with the name
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
This will take some time so you may want to grab a coffee or continue reading the guide (to be fair you really shouldn't be following this guide step by step without reading the whole thing first).
You can also replace the
createinstallmedia path with that of where your installer's located (same idea with the drive name).
Legacy createinstallmedia Commands
Pulled from Apple's own site: How to create a bootable installer for macOS (opens new window)
# Big Sur sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume # Catalina sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume # Mojave sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume # High Sierra sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume # Sierra sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app # El Capitan sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app # Yosemite sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ Yosemite.app # Mavericks sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --nointeraction
# Legacy Setup
For systems not supporting UEFI boot, see below:
Setting up Legacy Boot
To start, you need the following:
- BootInstall_IA32.tool or BootInstall_X64.tool
- This can be found in OpenCorePkg under
- This can be found in OpenCorePkg under
- Install USB(Created above)
Within your OpenCore build folder, navigate to
Utilities/LegacyBoot. Here you'll find a file called
BootInstall_ARCH.tool. What this does is install DuetPkg to your desired drive.
Now run this tool in terminal with sudo(This tool will likely fail otherwise):
# Replace X64 with IA32 if you have a 32-Bit CPU sudo ~/Downloads/OpenCore/Utilities/legacyBoot/BootInstall_X64.tool
This will give you a list of available disks, choose yours and you will be prompted to write a new MBR. Choose yes
[y] and you'll be finished.
This will provide you with an EFI partition with either a bootia32 or bootx64 file
# Setting up OpenCore's EFI environment
Setting up OpenCore's EFI environment is simple – all you need to do is mount our EFI system partition. This is automatically made when we format with GUID but is unmounted by default, this is where our friend MountEFI (opens new window) comes in:
You'll notice that once we open the EFI partition, it's empty. This is where the fun begins.