If anyone still at this post Im having same issues but not exactly sure on what to do...
After loading StyxDS on my DSTWO flash, I get the bunny image. Pressing any key makes the screen buggy. Best description is color static.
Im able to still get into options menu such as load rom. But it does little but change some static on top screen..

Read here that i need to get a Tos 1.2. I placed Tos 1.2 into rom folder aswell as where StyxDS is located..
Nothing changed and im still getting color static..

Honestly no idea what im doing... But still hoping ill be able to run sundog