The best choice is to buy a powersave.
As oot3d get PASLR (Physical memory randomization) , the hax installer is broken on CFW(or maybe some new FW, I'm not sure.).
I have faced the same problem some days ago when I need oot3Dhax on my new 3DS with 11.2 FW. Luckily I have another 3DS on 10.6 FW...