Boot into the Windows installer On the first screen press SHIFT + F10 # diskpart # list disk # select disk 0 # list part Look for the Windows partition # select part 3 # assign letter=W # format quick fs=NTFS # list volume Look for the EFI volume # select volume 2 # assign letter=Z # exit # D: Goto the USB installer of Windows # cd D:\sources # dir install* The file install.

Follow the steps below to install rEFIt to the EFI partition of an iMac Download rEFIt and copy the efi folder to the /efi folder as explained below Before you do the bless command disable the SIP Boot in recovery mode # csrutil status # csrutil disable # reboot sudo mkdir /efi sudo mount -t msdos /dev/disk0s1 /efi sudo bless --mount /efi --setBoot --file /efi/EFI/refit/refit.efi --labelfile /efi/EFI/refit/refit.vollabel