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OpenCore is an open source bootloader, designed to be an alternative to Clover. OpenCore aims to resolve the constraints and issues imposed by Clover by providing a more versatile and modular system. While OpenCore is primarily designed for Hackintosh systems, it can be used in any scenario where an emulated EFI is needed.

Please remember that OpenCore is still new and currently in beta. Unless you want to be on the bleeding edge of Hackintosh development or are planning on contributing to the project, you probably don't want to migrate if you have a stable system currently. Certain aspects of OpenCore such as Vault support will not be covered in this guide. Official release planned for October.

Lastly, this guide is only meant to be a starting point in your journey with OpenCore and not a beginners guide to hackintoshing. For those starting out, please see the r/hackintosh Vanilla Desktop Guide. And those who have issues can visit both the r/hackintosh subreddit and r/hackintosh discord for more help.

Advantages of OpenCore

  • On average, OpenCore systems boot faster than those using Clover.
  • OpenCore offers better overall security and better support for FileVault.
  • OpenCore supports boot hotkey support via boot.efi - hold Option or ESC at startup to choose a boot device, Command+R to enter Recovery or Command+Option+P+R to reset NVRAM.
  • OpenCore is designed with the future in mind, and uses modern methods to inject kernel extensions without breaking System Integrity Protection.
  • BootCamp switching and boot device selection are supported by reading NVRAM variables set by Startup Disk just like a real mac.
  • Furture development for AptioMemoryFix is directly tied to OpenCore, specifically being absorbed into OpenCore itself with the FwRuntimeVariable.efi being used as an extension.
  • UEFI and Legacy boot modes are supported.

OpenCore Tips

  • Kernel extensions are loaded in the order specified in your config file, so you must load an extension's dependencies before you load the extension itself. For example, Lilu must be loaded before WhateverGreen or VirtualSMC.
  • ACPI patches and SSDTs are applied to all operating systems. Adjust your SSDTs with If (_OSI ("Darwin")) {} or use rEFind in conjunction with OpenCore.
  • Some systems require pure UEFI mode to boot. (This setting is commonly called "Windows 8/10 Mode" by motherboard manufacturers.)
  • Issues can occur if NVMe devices are set up as SATA devices in the BIOS.

Hey why does this guide look quite similar to CorpNewt's Vanilla Guide?

Well, when I made the original OpenCore guide I was quite disappointed in how the whole thing was set up. It felt clunky, confusing and quite easy to get lost in as hardware-specific changes were hard to see. So I took CorpNewt's r/Hackintosh Vanilla Desktop Guide as a base and built it up from there. Full credit to him and also seriously a great guy, definitely check him out on Github(Don't worry I've talked to Corp about all this).

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