About Mac Pro EFI Firmware Update 1.3
This update fixes several issues to improve the stability of Mac Pro (Early 2008) computers.

After the firmware is successfully applied to your computer, your BootROM Version will be:
MP31.006C.B05

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

To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/Mac Pro 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

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