Classic Mac Pro 5,1 (or simply cMP, also 4,1 upgraded to 5,1) is now considered by Apple as vintage. It’s pretty disappointing considering how capable and upgradable these machines still are. Installing Windows is no longer officially supported, but it’s completely possible though not quite easy.

Anybody know where I can download a Windows 10 1803 ISO version. I am attempting to install Windows 10 on my 5,1 via DVD and the current version is much to large to burn to a disk. Boot Camp 5.1.5621. Breaks System restore functions. Unable to create restore points on windows 10. Magic mouse wont work if you have a usb mouse hooked up during install. Remove any usb mouse and use magic mouse during install of win 10, if you want magic mouse to work. Mar 14, 2013 Boot Camp Support Software 5.0.5033 This download contains the Windows Support Software (Windows Drivers)you need to support 64 bit versions of Windows 7 and Windows 8 on your Mac. For more information on which operating systems are supported on different Mac systems, click here. Install BC drivers for cMP 5,1. Download brigadier-0.2.4.zip and extract the exe file. Open CMD as Administrator & navigate to the folder with brigadier.exe. Execute (from command line) brigadier.exe -m iMac Pro1,1. Wait for download to finish, this will be the BC6.1 drivers. Navigate to the BootCamp/Drivers/Apple/. Run BC Assistant - Action - Download and use a USB2 Flash drive, which will be formatted/erased. Question: Q: Boot Camp Support Software 5.1.5621 More Less.

Another challenge is that macOS Mojave 10.14 now implies using Metal-capable GPU while most of them are not able to display Apple boot menu (which you normally see holding the Option key) required to boot into Windows. Basicaly your screenremains black until macOS is loaded. Well, some EFI bootable cards that support boot menu exist but they are released almost 10 years ago and are really outdated. What is more, none of them supports displaying of boot menu with 4k 60hz monitor connected.

This guide is for those who want macOS Mojave + Windows 10 + modern GPU (in our case Sapphire Radeon Pulse RX 580 8GB).

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Updated 28 May 2019

Installing Windows 10 in 5 steps

It’s supposed that you have the latest Boot ROM version 144.0.0.0.0. If not, please update first.

Step 1: Use separate drive for Windows

Boot Camp Assistant no longer supports cMP and doesn’t allow creating a separate partition for Windows.Windows has to be installed on a separate drive, which is good actually to avoid messing with partitions in future.

We recommend using the internal SATA II connector in one of four drive bays or alternatively one of two SATA II connectors in the optical drive area. Using the HP 654540-001 3.5” → 2.5” adapter (7$) to place 2.5” SSD in a drive bay can be quite convenient.

Of cause, SATA II (up to 300MB/s) is a bottleneck for modern 2.5” SSDs (up to 550 MB/s where SATA III is preferable) but real life experience shows that the difference is hardly noticable unless you deal with lots of big files (e.g. >1GB where sequential read/write speeds matter) on your system drive.

We didn’t test using PCIe → SATA III adapter or PCIe → NVMe adapter for Windows partition. Many people reported it was not possible in their case. If you successfully did it please let us know in the comments below or via e-mail.

Step 2: Create a bootable Windows 10 DVD disk

Warning: DO NOT install Windows from a USB flash drive. It has been discovered that Windows when installed in EFI mode is corrupting the Mac Pro’s firmware by signing it with multiple Secure Boot (X.509) certificates. Also, you wouldn’t be able to boot into Windows after selecting its drive as bootable in macOS Preferences → Startup disk. Therefore Windows should only be installed in Legacy BIOS mode from an optical drive.

Make sure that your Windows 10 ISO file fits on the DVD disk, in our case we had to burn Windows 10 1803 ISO (64-bit) to a single-layer DVD+R disc 4.7GB.

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Burning a DVD disk under macOS can be done with the following Terminal command:

On Windows we recommend using the free ImgBurn app.

Step 3: Boot from your Windows 10 DVD disk

Turn on your mac while holding the “C” key to boot from the optical disk (if you have PCIe drives installed and can’t boot from the disc, remove those PCIe adapters).Proceed with installation normally until you see the “Where do you want to install Windows” drive selection screen.

Step 4: Format the target drive

Press Shift+F10 to launch command prompt. Type the following commands:

Now make sure to select the correct target drive number N (NOT your macOS disk), after that type:

You should now see your drive as Unallocated space.

Press the “New” button to create necessary partitions. There should be only two partitions (for legacy installation, EFI mode creates four) automatically created:

Select the newly created partition 2 and continue with installation normally. Your mac will be rebooted twice.Every reboot do not forget entering the boot menu (by holding the Option key) and selecting ‘Windows’ boot drive there. When finished, boot into Windows.

Step 5: Install Windows drivers and Boot Camp utility

Windows 10 installs all necessary drivers automatically except Bluetooth and internal speaker. These need to be installed from the original Boot Camp package for MacPro5,1.Download and install 7zip, download Brigadier 0.2.4 app, open Windows command prompt where Brigadier is located and type:

When finished, it will create a folder BootCamp-031-11269, you need to install these for Bluetooth and internal speaker correspondingly, make sure you run the command prompt as administrator:

Now we need newer BootCamp drivers intended for iMacPro1,1:

When finished, it will create a folder BootCamp-041-55643, you need to run this command:

When finished, reboot. We also recommend running Apple Software Update to update Wifi drivers:

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You probably don’t want to forget installing our awesome Macs Fan Control app, do you? :)

Switching between macOS Mojave & Windows

When you’re in macOS, use Preferences → Startup disk to select a boot drive:

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When you’re in Windows, use the Boot Camp Control Panel from your Windows tray to select a boot drive:

This guide is based on this MacRumors thread. Special thanks to h9826790 for sharing his useful experience. Any comments are welcome.