if you will not help, or give information that may help him, you shouldn't not answer.
MgPeanut do you mean its a slot 2 homebrew (that runs on a gba card)?
if it runs on a normal card (like r4 acecard or dstwo) on a DS, it will be the same thing on a 3ds, there is no difference.
if its an homebrew which tries to access data on the sd card, probably you will need to dldi patch it...
if the problem is "hexends" are you sure you put the right wad in the right place?
could you please tell me what you do, i will try to give a try on my DS and tell you what is the problem?