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Guide: Windows 8.1 Pro Update 1 64bit install on Mac Pros with 32-bit EFI


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Stuff you need:

- Mac Pro (Of course...)

- Windows PC with 64bit CPU and SATA

- Windows 8.1 Pro (Just for dual CPU support, if installed on something like "07 MacBook, normal Windows 8.1 is enough)

- A lot of patience.

 

1. Partition a part of your HDD to MS-DOS (FAT)

2. Shut down your Mac

3. Connect the HDD to PC

4. Boot from DVD or USB using the PC, without internet connection.

5. Shut the PC down, when it reboots the first time.

6. Plug the HDD to Mac Pro.

7. Boot from Windows partition

8. Let the setup finish.

9. Congratulations! You just have installed Windows 8.1 64bit on a mac, which apple says, that latest Windows possible is 32-bit Vista :D

 

You have to do the install with the PC, because boot from 64-bit Windows DVD doesn't work with 32-bit EFI.

 

Hope this helps someone.

 

Nuutti

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