Open a terminal window then copy and paste the below command: If you've already mapped your USB ports (opens new window) and disabled XhciPortLimit, you can boot macOS 11.3+ without issues.įrom a macOS machine that meets the requirements of the OS version you want to install, go directly to the App Store:įor machines that need a specific OS release or can't download from the App Store:įrom 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.CAUTION: With macOS 11.3 and newer, XhciPortLimit is broken resulting in boot loops (opens new window).macOS 12 and above note: As recent macOS versions introduce changes to the USB stack, it is highly advisable that you map your USB ports (with USBToolBox) before installing macOS.This method allows you to download macOS 10.13 and newer, for 10.12 and older see Downloading macOS: Legacy OS. For everyone else, you can either download macOS from the App Store or with Munki's script. You can skip this and head to formatting the USB if you're just making a bootable OpenCore stick and not an installer.
To start we'll want to grab ourselves a copy of 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. Getting started with ACPI (opens new window).Now with all of this done, head to Setting up the EFI to finish up your work.In the window that appears just below the macOS version number, you'll find your Mac's model name and year of release. To see your Mac model, click on the Apple menu at the top-left corner of your screen and select About This Mac from the dropdown. To see if your Mac is compatible with an older version of macOS, you need to find out what model of Mac you own and check if that model matches the OS's technical specifications.
It's highly dependent on the older macOS you want to use and the Mac you're working with.
So, if you have a Mac with an Apple silicon chip like an M1 or M2 MacBook, you can't have High Sierra as your operating system.Ī 2017 Mac can run a ton of different macOS versions, though. Some older macOS versions, like macOS 10.13 High Sierra, require Intel 64-bit processors found in older Macs to run. So, follow the steps below to get the downgrade of your dreams! Make Sure Your Mac Can Use an Older macOSīefore you can download an old macOS onto your Mac, you must ensure your Mac can actually run the software. We can teach you how to get old versions of macOS on your MacBook or iMac today.
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