Ecco The Dolphin Cheats...

I've tried this cheat out, but it doesn't seem to work for me. I remember years ago I tried a cheat and it worked, so I know it is possible, I'm just not sure if this is the same one, or if I have to have a saved name previously, or what? Any help on the exact way and conditions would be greatly appreciated, cause I'm not good enough to get to where I want to explore..
,thanx

" Level select:
Select the ''New Game'' at the VMU menu, then enterGYU as a name but do not select "End". EnterGYU as a name for that game again, but do not select "END".Then, enter any letter three times as a name and press X.If done correctly, you will be returned to the VMU menu. You cannow create a new game as usual or resume a saved game. The nexttime you save the game, all levels will be unlocked. Additionally,a choice for the soccer mini-game will appear at the bottom ofthe level selection screen. "

that's cause your an idiot...it says "X" (the yellow key) not "A" (the red one)
now try it...