This one works!! i could use WiiFrii 2.3 to patch the ISO by using this method!
However, i've another problem.
I'm using NTSC-J concole and WiiKey 1.9g.
Mario Kart always display Japanese even I force the ISO to NTSC-U and English language in WiiFrii 2.3.
(i've tried both PAL and JAP iso)
i...