what is the difference of a n5 and a e7. (people who are reading this please dont go buy a n5 or e7 just becauses i mentioned it becauses n5/e7's are fake r4s and they do brick your DS.)
They do that by either shortcircuit themselves, or by shortcircuiting while in your DS, thus damaging the core and circuits inside. Probably nothing, the N5 uses differently labelled R4 firmware, while the E7 uses straight R4 firmware I believe.