In DStwo, even with the newest patch, be sure to run it in Clean Mode. Why am I helping? Well, even supreme overlords need to show a little generousness.
I'm not trying to be cruel or offensive or anything like that, but this is no 'help'.
This is repeating what someone else has said repeatedly, whilst not advancing the issue any bit.
I, alongside 8Bit, have tried clean for all version of the ROM I downloaded (about 4 different versions (apparently)), and none have proven successful on my SCDS2.
It would be cool if someone who's gotten it working on their DS2 could upload their file or something, because I've updated, and changed all the files (EOS and that stuff) to suit what I've been told I require, and nothing has been successful.