Mac Pro Firmware Updates, Firmware Restoration CD v1.1
20/09/06 | Update
Mac Pro (mid 2006) EFI Firmware Update 1.0
This EFI Firmware Update fixes several Boot Camp and start up issues on Mac Pro computers:
http://www.apple.com/support/downloads/macpromid2006efifirmwareupdate10.html

Mac Pro SMC Firmware Update
The SMC Firmware Update adjusts fan behavior in the Mac Pro:
http://www.apple.com/support/downloads/macprosmcfirmwareupdate.html

Firmware Restoration CD v1.1
This update is used to restore the firmware of an Intel-based iMac (early & mid 2006), Mac mini (early 2006), MacBook Pro (early 2006), Mac Book (early 2006), or Mac Pro (mid 2006) to original factory condition:
http://www.apple.com/support/downloads/firmwarerestorationcd11.html

It can only be used to restore the Firmware after an interrupted or failed update.