er.. I just did this on a n3dsxl and all you need is cubic ninja and the QR... and the 3ds <=9.2 fw.
After that just restart cubic ninja/level design and it starts up your homebrew launcher or whatever...
Or did the OP mean hacking via using a "backup" from a sky3ds? In which case, no idea, as cubic ninja is cheap and on top of that looked like a game that I MIGHT play at least a little, which is similar logic applied to my using tales of symphonia for vwii hacking on my new wii u. I like RPGs, the store had it, it was cheap, and it had a working exploit, so I got the exploit plus a bonus game with manuals and everything.