In keeping with past efforts, Apple has released a Firmware Restoration CD for early 2009 Mac Pro and Xserve models. The CD can be used to restore your computer's firmware in the event of an unsuccessful or interrupted update, though if that's already happened, you'll need to download the disc image and create a CD on another computer or bring your machine to an Apple Store or Apple Authorized Service Provider. The CD can be made on any Mac, but can be used only on the supported models. (Free, 22.5 MB)
Copy Disk Image as Folder
When you open a .dmg file, a disk image is mounted. You are then generally supposed to copy the contents of that disk image to your hard drive (to your Desktop, your Applications folder, or wherever). But what if you want to copy the whole disk image, including all its contents, as a folder? Hold the Option key, and drag the "proxy icon" in the title bar of the disk image window to the destination in the Finder.