softmod 4.2U, CFG loader no go but I only tried ios249. burned the image and ran it with Neogamma, game friezes to black after the nunchuck required screen. I'll give the hermess 222 v4 a try when home.
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan