For all quad-core Intel Core i5 and i7 27-inch iMacs.
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:
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
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