Late Monday, Apple released Thunderbolt Firmware Update 1.0, a 486 KB download focused on providing stability and performance fixes for Mac with the new Thunderbolt port. The update will restart your Mac with a gray screen a status bar to indicate the progress of the update.
While the update is taking place, do not disturb or shut off the power on your computer during this update.
The update is also available via Mac OS X’s Software Update feature and requires an Intel-based Mac running Mac OS X 10.6.7 or later to install and run.