I ran across this article today. Even though I don’t have a comparable device, I think some of you might be benefit from it.
The article is for changing the firmware of iPod Video 5G or 5.5G. With the new firmware, you can download some free public domain games. The tutorial is for Windows computers. Scroll down the page, you can find some brief info about how to do it on a Mac.
Click on this link to read the full article.