What is opencore-legacy-patcher?

dortania/opencore-legacy-patcher — explained in plain English

Analysis updated 2026-06-24

★ 17,387PythonAudience · generalComplexity · 3/5Setup · moderate

Mindmap

mindmap
  root((OpenCore Legacy Patcher))
    What it does
      Run modern macOS on old Macs
      No firmware modification
      Supports Macs from 2007
    Features
      Graphics acceleration
      Wi-Fi and Personal Hotspot
      OTA system updates
      Security features preserved
    Tech Stack
      Python
      OpenCorePkg bootloader
      Lilu runtime patcher
    Use Cases
      Extend old Mac life
      Install Sequoia on old hardware
      Keep security features active

mindmap root((OpenCore Legacy Patcher)) What it does Run modern macOS on old Macs No firmware modification Supports Macs from 2007 Features Graphics acceleration Wi-Fi and Personal Hotspot OTA system updates Security features preserved Tech Stack Python OpenCorePkg bootloader Lilu runtime patcher Use Cases Extend old Mac life Install Sequoia on old hardware Keep security features active

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What do people build with it?

USE CASE 1

Install macOS Sequoia on a 2012 MacBook Pro that Apple no longer officially supports.

USE CASE 2

Restore graphics acceleration, Wi-Fi, and AirPlay features on an older Mac running a patched modern macOS.

USE CASE 3

Keep over-the-air macOS system updates working on an unsupported Mac without re-flashing its firmware.

What is it built with?

PythonOpenCorePkgLilu

How does it compare?

	dortania/opencore-legacy-patcher	jianchang512/pyvideotrans	allenai/olmocr
Stars	17,387	17,387	17,320
Language	Python	Python	Python
Setup difficulty	moderate	hard	hard
Complexity	3/5	4/5	4/5
Audience	general	general	researcher

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 1h+

Only clean installs and macOS upgrades are supported, requires following a multi-step process using the provided GUI installer.

License not specified in the explanation.

So what is it?

OpenCore Legacy Patcher is a Python tool that lets you install and run modern versions of macOS on older Apple computers that Apple itself has stopped supporting. The project's stated goal is to breathe new life into Macs no longer supported by Apple, allowing the installation of macOS Big Sur and newer on machines as old as 2007. In practice this means a Mac that Apple has cut off from updates can still run Big Sur, Monterey, Ventura, Sonoma, or Sequoia. The way it works is by building on top of two existing projects from Acidanthera: OpenCorePkg, a bootloader that pretends to be the firmware a newer Mac would have, and Lilu, which patches the operating system at runtime. On top of that foundation, this patcher adds the macOS-specific tweaks needed for old hardware, graphics acceleration for both Metal and non-Metal GPUs, Wi-Fi and Personal Hotspot support on older wireless chipsets, enhanced power management for non-Apple SSDs, and unlocking features like Sidecar and AirPlay to Mac. It supports Macs back to the Penryn generation, keeps over-the-air system updates working, and preserves security features like System Integrity Protection, FileVault 2, and Secure Boot. It does this without permanently modifying the Mac's firmware. Someone would use this if they own an older iMac, MacBook, or Mac mini that Apple has dropped from the supported-hardware list and they want current macOS releases instead of buying new hardware. Only clean installs and upgrades are supported. The project is written in Python and ships an installer GUI, community support lives on a Discord server. The full README is longer than what was provided.

Copy-paste prompts

Prompt 1

Walk me through using OpenCore Legacy Patcher to install macOS Sonoma on a 2013 iMac that Apple no longer supports.

Prompt 2

After running OpenCore Legacy Patcher, how do I apply root patches to restore Metal graphics acceleration on my older Mac?

Prompt 3

Does OpenCore Legacy Patcher preserve FileVault 2 and System Integrity Protection on unsupported Macs, and how does it do that?

Prompt 4

How do I receive and apply over-the-air macOS updates on a Mac running OpenCore Legacy Patcher without breaking the setup?

Prompt 5

What is the difference between OpenCorePkg and Lilu in the OpenCore Legacy Patcher setup, and what does each one do?

Frequently asked questions