# hdiutil convert /path/to/refit-0.14.cdr -format UDRW -o /path/to/refit-0.14.img # diskutil list # diskutil unmountDisk /dev/disk2 # sudo dd if=/path/to/refit-0.14.img.dmg of=/dev/rdisk2 bs=1m Using rdisk2 here seems to speed up things # diskutil eject /dev/disk2

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