Yes and no. It is possible on a lot of games, but the method for repackaging roms is unknown to common users.
Smash Brothers is an example of a game that uses a new encryption method, making it impossible for people here to do anything with it.
So some people have been able to modify the Smash 3ds ROM and play it, but it's not available to people outside those circles?
I have some textures I made that I'm looking for help on inserting. For now it's some basic stuff, stuff like Outset Toon Link, but I'd love to do more in the future.
Would it be possible to lead me to someone who would know how to insert it?