The problem is the dash gets updated fairly regularly, and newer games come with newer dashes.
All that you can do is make sure to never let a game update your dash while running from a hacked bios. They normally do ask luckily, but the StarWars Trilogy DVD demo does not!
If you have a game which wants to update your dash, boot into retail mode and let it update it, then boot back to hacked bios and then you will have the latest dash

I don't know what dash Slayers comes with. I assume its currently the latest as slayers 2.6 is fairly recent, but as soon as another update comes out, it'll be out-of-date
