Here's a nice example: http://www.blackhat.com/presentations/bh-usa-09/CHEN/BHUSA09-Chen-RevAppleFirm-PAPER.pdf http://www.blackhat.com/presentations/bh-usa-09/

Here's a nice example: http://www.blackhat.com/presentations/bh-usa-09/CHEN/BHUSA09-Chen-RevAppleFirm-PAPER.pdf http://www.blackhat.com/presentations/bh-usa-09/CHEN/BHUSA09... "we describe how to tamper with a firmware upgrade to the Apple Aluminum Keyboard. We describe how an attacker can subvert an off-the-shelf keyboard by embedding into the firmware malicious code which allows a rootkit to survive a clean re-installation of the host operating system."