This update fixes several issues to improve the stability of MacBook Pro computers.

After the firmware is successfully applied to your Mac, your Boot ROM Version will be:
MBP21.00A5.B08 or MBP31.0070.B07

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

For further information on this Update, please visit this website: http://docs.info.apple.com/article.html?artnum=303364