According to the following Microsoft page it looked like removing the bootmgr file might do it, but the DVD would not boot at all when I removed the bootmgr file. So I tried to modify the Win10 iso to create an installer DVD without any BIOS booting in hope it would then boot UEFI. I tried all sorts of versions of the Bless command from the terminal, but everything I tried to bless the EFI folder or EFI files only resulted in booting legacy-BIOS. It only shows the Installer DVD with a single Windows icon, and that boots into legacy-BIOS mode. You also can't choose from the Startup Disk preferences pane. If you simply allow the DVD to boot automatically (by holding the C key while restarting) it ALWAYS boots in the legacy-BIOS mode. Win 10 will automatically be installed to boot in the same mode chosen to boot the Installer.īut when a Mac Pro video card can’t produce a boot screen you can't choose. Holding the Option key while restarting a Win 10 Installer DVD produces two Installer boot choices on the Boot Manager Screen - UEFI or Windows (legacy-BIOS).
My Objective - to force a Win 10 Installer DVD to boot in UEFI Mode on a 2010 Mac Pro without a boot screen
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