Are you using traversal connection?
You and your friend should verify the md5 of your games and make sure they are the same. If they aren't there will be problems playing.
Also try connecting with neither of you having a memory card to see if that works.
Do you have an screenshots you could post? What errors are you getting?
You and your friend should verify the md5 of your games and make sure they are the same. If they aren't there will be problems playing.
Also try connecting with neither of you having a memory card to see if that works.
Do you have an screenshots you could post? What errors are you getting?