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This Github project is a new and updated branch of the Yosemite tree and is now targetted at OS X 10.11 El Capitan.


This project aims to add support for El Capitan (OS X 10.11) for unsupported Mac hardware with a 32-bit only EFI implementation. Like for example the first and second generation Mac Pro models. Though it should work well with any other model with a 32-bit EFI implementation.

Current State

The current state of this project is: Phase 1, 2 and 3 completed (OS X 10.11 El Capitan is now fully supported).

Note: For more information about the development phases, please visit the TODO list.


Prebuilt copies of boot.efi can be downloaded from the project download page.


Don't want a prebuilt copy of boot.efi then compile the source code yourself, with either Microsoft Visual Studio 2013 or 2015. The latter requires you to update the solution files, but that should be done automatically in the MS Visual Studio IDE.

Note: See also Compiling-Instructions

Thanks To

This project would not have been possible without the help of Peter Holbrook and Mike Boss. Peter did all compiling and Mike ran dozens of test builds that Peter pushed out over at Awesome work guys. Job well done!


If you like to support my work then you may want to consider to make a donation


If you need help with the setup then please visit this macrumor thread

Note: Sorry. I can't help you. I don't have unsupported hardware with 32-bit EFI.


Bugs can be reported here

Note: Please provide a clear step by step way to reproduce the bug.


My work is licensed under the Creative Commons Attribution-NonCommercial 3.0 Unported License and as such you must add a link to this license. Even if you only use a download link. Also note the term "NonCommercial" because I don't want to see my work end up anywhere else but here.

Note: "Tiamo" released his work under a BSD-3-Clause license


Copyright (c) 2014-2015, by Pike R. Alpha – All right reserved.

Macosxbootloader is maintained by Pike R. Alpha.

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