Mega Man Battle Network 4: Red Sun Tips

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okay im a girl. if your wondering wt im talking abt, when you get to a part were a guy tells you that he will make megaman stronger or some thing(by the way i passed this part a looong time ago and in about 1hr from the beginning. no lie)like that he actually installed a virus folder or something? when you get to the part were a old man comes to help you. well if you can't figure out the password all you do is put in a bunch of numbers, then change the ones the man says is wrong and bingo!