If you’re thinking about updating your Macteltosh’s firmware (iMac, mini or MacBook Pro), you may want to visit Apple and download a copy of the Firmware Restoration CD first. You’ll need a copy of this CD on hand for failed firmware updates.
You can only use this to restore the Firmware after an interrupted or failed update. If your computer is already in this state, you’ll need to download the software and create the CD on another Macintosh computer, or you can take your computer to an Apple Store or Apple Authorized Service Provider to restore your firmware. This CD can be created on both PowerPC and Intel-based Macintosh computers…This CD cannot be used to return an Intel-based Macintosh computer’s firmware to a previous version if a successful update has already been performed.
- Power on the computer you want to restore, holding down the power button until the LED blinks rapidly followed by a 3-quick blink/3-slow blink/3-quick blink series.
- Release the power button.
- Insert the CD into your optical drive and wait. There’s nothing more you need to do until the computer restarts. The startup beep occurs at least 30-60 seconds after you begin this process and a progress bar will appear to keep track. Do not unplug or otherwise mess with your computer during the update.