I am not very tech savvy, we got my kid a used 3ds for Christmas, I was not told the unit was hacked, I am getting the arm11 error now, the unit is unusable, I do not have the original memory card and the seller will not talk to me. I've done some research and know what caused the problem but I don't know enough to fix it. I found the needed files but I don't know how to update/install anything.