This update is recommended for all Mac Pro (Mid 2010) models and addresses the following issues: Resolves an issue that prevented the firmware password prompt from being displayed. efi extension) like vmlinuz.efi, copy the initial. efi (Apple's EFI refuses to start anything that doesn't end with. vmlinuz-3.13.) in it, renaming the file so that it ends with. Simply create a small HFS+ partition, copy the linux kernel efi stub (e.g. No need for complicated folder hierarchies. Bingo!!!! Apple's EFI is working and the solution is simpler than expected.