Apologies, got my terminology messed up.PAL and NTSC is an analog television standard. It has nothing to do with 3DS, neither any handheld.
Anyway, what you want is to change the region of your 3DS. Here's a guide for it.
What do you mean it doesn't work anymore?Apologies, got my terminology messed up.
That guide doesn't work anymore
Apologies. A client asked me to change the region and it took a while to properly understand