Apple has released a variety of firmware updates:
• Mac Pro (mid 2006) EFI Firmware Update 1.0 (1.8MB)
This EFI Firmware Update fixes several Boot Camp and start up issues on Mac Pro computers.
• Firmware Restoration CD 1.1 (14.5MB)
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. It can only be used to restore the Firmware after an interrupted or failed update.
• Mac Pro SMC Firmware Update (less than 1MB)
The SMC Firmware Update adjusts fan behavior in the Mac Pro.