iMac EFI Firmware Update 1.2

About iMac EFI Firmware Update 1.2

This update improves the performance and reliability of Intel Core 2 Duo processors and fixes issues with Boot Camp for iMac computers.

After the firmware is successfully applied to your computer, your BootROM Version will be one of the following:
IM51.0090.B09
IM52.0090.B09
IM61.0093.B07

You can confirm the version of the BootROM installed on your computer using System Profiler.

To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/iMac EFI Firmware Update.app). The updater will launch automatically when the Installer closes.

For more information about firmware updates for Intel-based Macs, please visit: http://docs.info.apple.com/article.html?artnum=303364