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Apple 27-inch iMac EFI FW Update...The update is recommended for all quad-core Intel Core i5 and Core i7 processors 27-inch iMacs.

This update addresses the following:

  • Resolves an issue that sometimes caused high processor utilization while playing audio through the headphone output mini-jack.
  • Resolves an issue that prevented the display backlight from turning on after powering on the iMac.
When your computer restarts a gray screen will appear with a status bar to indicate the progress of the update. Do not disturb or shut off the power on your iMac during this update.


27" iMac.

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27-inch iMac EFI FW Update User Discussion

5 1


Current Version (1.x)


Downloads 832
Version Downloads 831
License Updater
Date 14 Apr 2010
Platform Intel 64 / OS X / Intel 32
Price Free
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