It's probably too new for Ninjhax 2.1.I noticed that with Tri Force Heroes, svdt appears to lockup on initialization. The bottom screen turns red, the top remains black, and the 3DS is hard-locked until a power cycle. Was hoping to be able to backup saves for the game, as well as maybe add some friendly tokens to my game, since those are realistically impossible for me to get. (I don't know any 3DS users locally, much less 15 !)
2.5 is coming very soon though! It might fix the problem!