I forgot to make a backup of my EFI System Partition (ESP) and have installed grub onto it.
If I happen to accidentally mess up the partition, will OS X be bootable? If not, how would I restore the EFI System Partition without having a backup?
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OS X will still be bootable. See rEfit Myths & Facts About Intel Macs for more extensive explanation, including Grub specific Q&A.– njbootCommented Jun 25, 2014 at 19:00
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1 Answer
If it happens you mess it up, you can download it from Apple.
EFI and SMC firmware updates for Intel-based Macs
This article lists firmware updates that were released for Intel-based Macs. They update the firmware that originally shipped from the factory. If your computer isn't on this list, then you don't need an update to the factory firmware.
