iMac EFI Update 2.1

Updates the EFI firmware on your iMac computer
iMac EFI Update
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The iMac EFI Update installer will update the EFI firmware on your iMac computer. When the iMac restarts, a gray screen will appear with a status bar to indicate the progress of the update.

It will take several minutes for the update to complete. Do not disturb or shut off the power on your iMac during this update.

last updated on:
September 25th, 2013, 5:57 GMT
file size:
8.7 MB
developed by:
license type:
operating system(s):
Mac OS X 10.8.4 or later
binary format:
Intel only
Home \ System Utilities
iMac EFI Update
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What's New in This Release:
  • This update addresses an issue which may cause a black screen to appear when installing Windows 7 or Windows 8 using Boot Camp Assistant if both an external optical drive and USB thumb drive are connected to the system.
  • This update also ensures that the system will boot by default into OS X after installation of Windows 8.
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