shell22, if memory serves, those instructions were for a Kindle 1, and didn't work for a 2 or 3.
You might want to start here:
https://wiki.mobileread.com/wiki/Kind...nd_3.x_Kindles
Additionally, if you have a SO Kindle, part of what you agreed to when purchasing the SO was the advertisements, so the screen saver hack isn't designed to work with the SO versions.