M3 DS Real Adapter

Hi Folks, I'm new here, found your site when trying to find out what I am doing wrong with my M3 DS Real Adapter. A friend told me to get one of these and so that I can use Homebrew games, I can't get it to work at all as it says there is a system file missing, where can I get this system file which I think might be System V3.0. I bought the adapter from a site which has links on this site but can't get a reply from them! I guess I don't know what I'm doing so any help or advice would be great. I believe with this I can also play music on my DS and view photographs??????? Please take pity on my someone and tell me what to do!!!! Thanks in anticipation! Regards Nell2165