wrong i recently tried the nitrohax on my dsi (version 1.4.1A) and using the hyper4i cart (which if my memory is correct they discontinued) and the nitrohax works all but on heart gold and soul silver and more recent games atm it does let u cart swap but u have to swap after the u choose the xml...
i don't know if anyone else has had this problem but i was playing the newest patch and i noticed when i got into a battle with my save originally started on the non patched version when i got into a battle on the patched version is didnt have the fight option so i dont know if this is a 100%...