About this updateQUOTE
If you are updating a portable Mac, make sure that your AC adapter is plugged in. The Firmware Updater application will not run unless the computer is connected to AC power.
Locate the appropriate update for your Macintosh model, and download it to your computer by clicking the update's title, then clicking on the file size indicator in download details or at the bottom of the page.....
Some USB and FireWire devices may prevent firmware updates from installing correctly. If you are having trouble installing an update try disconnecting non-essential devices and use only an Apple keyboard, mouse, and display.
MacBook Pro
Intel iMac
Mac Pro
MacBook
Despite reading problems on other boards, I applied the update with NO problems.