By asking "where" I meant to ask if you're talking about launching from a cart or emunand, not what website did you get the rom images.
Please do not link such sites as they are against the rules. I'd suggest editing your post to remove the link.Thanks
What games though and what FW version is your emunand?
As I mentioned some games require newer FW, if these are newer titles this is likely your issue.
Edit: you mention 6.0, if your nands are linked and you haven't updated emunand you are likely on an extremely old emunand FW too and you'd constantly run into the issue of having too low a FW to run most games.