Legacy Install

Last editied: January 27, 2020

Wanna try OpenCore but can't boot UEFI based sources? Well don't fret, there's hope for you! OpenCore supports DuetPkg which emulates a UEFI environment for legacy systems.

To start, you need the following:

  • BootInstall.command

  • Install source(MacOS Journaled + GUID, size of USb depends on the version of macOS. 16GB recommended for catalina)

BootInstall Location

Within your OpenCore build folder, navigate to Utilities/BootInstall. Here you'll find a file called BootInstall.command. What this does is install DuetPkg to your desired drive.

Now you'll want to run BootInstall.command, do note that you may need sudo for this to work correctly on newer versions of macOS

sudo Utilities/BootInstall/BootInstall.command
Disk Selection/writing new MBR

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.

Finished Installer
Base EFI

This will provide you with an EFI partition with a boot file, this is where we'll add our OpenCore EFI.

Note: You will need AppleUsbKbDxe.efi for picker support