Apple skrev: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.
Apple skrev:5. Read the onscreen instructions and click Shut Down to proceed with the update. The firmware image will be loaded on your machine, and your machine will shut down, but the update will not be installed until the next step.
6.Hold down the power button until the power indicator light flashes, then release it. A long tone will be heard, then a gray screen with an Apple logo appears. There is a progress bar under the logo. As the progress bar moves, your firmware is being updated.
Important: Do not unplug, shutdown, or restart your computer while the update is taking place. Interrupting a firmware update can render your computer unusable. If this happens, take your machine to an Apple store or authorized service provider or perform the recovery yourself using another Macintosh computer to download the Firmware Restoration CD disk image from http://www.apple.com/support/downloads/. This software allows you to create a CD which you can use to restore your machine to working order.
Installation takes a few minutes.
7. After your firmware has been updated, your machine will restart.
8. After you log in, a dialog box will appear indicating the firmware update has been successful. Click OK to dismiss this dialog.
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