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Creating Bootable macOS Installer with Legacy Patcher

Creating a vanilla, unmodified macOS install media using OpenCore Legacy Patcher (OCLP) is not its primary intended use. OCLP is mainly designed to enable the installation of newer macOS versions on unsupported Mac hardware. However, you can use OCLP to create a bootable macOS installer, but it will include the OpenCore bootloader and potentially some patches.

If you're looking for a completely unmodified macOS installer, it's best to create it directly through Apple's provided methods, like using the createinstallmedia command in Terminal on a Mac or downloading the macOS installer from the App Store and creating a bootable USB using Disk Utility or third-party tools like BalenaEtcher.

If your goal is to use OCLP to create an installer that's as close to vanilla as possible (though still technically modified), here's a basic guide. This is intended for intermediate users who are comfortable with bootloaders and command-line tools.

Creating Bootable macOS Installer with OpenCore Legacy Patcher
Skill Level: Intermediate

This guide assists in creating a macOS install media with minimal modifications using OpenCore Legacy Patcher.

  1. Download the latest version of macOS from the App Store on a Mac.
  2. Plug in a USB drive (at least 16 GB) and format it as macOS Extended (Journaled) using Disk Utility.
  3. Download OpenCore Legacy Patcher.
  4. Open the OCLP application and select the option to Create macOS Install Media.
  5. Choose the downloaded macOS installer and the USB drive as the target.
  6. Follow the on-screen instructions to create the bootable media.
  7. Once complete, the USB drive will contain the macOS installer with the OpenCore bootloader.

Note: This process will create a bootable installer with minimal modifications, primarily the inclusion of the OpenCore bootloader. It's not entirely 'vanilla' but is often suitable for various installation scenarios.

It's always kind of a pain when we need to manually build a new MacOS installer USB stick at my help desk.

It's not the intended use of the tool, but is it possible to create vanilla, unmodified but bootable MacOS install media using OCLP?

submitted by /u/matt314159
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