Problem with Capcom v/s SNK 2 custom music

[Busterwolf]

Hi everyone...........a few days ago I tried to make this game with custom music, I changed the music for every stage and then I realized that all the data could not fit in a 700 megas cd so I took out the file 0.dat (I think this was a dummy file) and I made a new one smaller than the original and I rename it just like the original. After that I made the game selfboot again using dssbsfinal because I did not want to use the echelon selfboot method because I always end up making a coaster with that selfboot method (and I don`t like to use Cdrwin). Well, the game boot up as usual but right after the Sega logo the screen goes black for a few seconds and then resets to the Dreamcast menu............so my question is.......what did I do wrong??

Please any advice is more than welcome

Excuse my english but is not my native tongue, I hope you can understand what I tried to say......