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OS X Hackers

OS X 10.6 Snow Leopard was the first OS X version with optional support for a 64-bit kernel, allowing booting either with a 32-bit or 64-bit kernel. However, Apple did not support booting the 64-bit kernel in Macs that shipped with EFI32 firmware, even if they had 64-bit processors capable of running the 64-bit kernel. When Apple dropped the 32-bit kernel entirely from OS X, starting with OS X 10.8 Mountain Lion, EFI32 Macs no longer had an Apple-supported mechanism to boot newer OS X versions.

Fortunately, we have found a work around for these version of OS X. Here we provide guides and support for Installing OS X Yosemite on your Unsupported Mac.

OS X Hackers Site
http://OSXHackers.net/Yosemite

MacRumors Thread
http://forums.macrumors.com/showthread.php?t=1761432 

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