I think there is one way how to undo to cheat, or, of course, resetting the Playstation does help. Try to go to the Adventure Mode and the exit it. It seems to undo every cheat. Then you have to do every cheat again.
However, if you mean a cheat, such as a character, you can't undo it.
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Q:How do you unlock nitros oxide faster? is there a cheat or something?
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I'don't know how but in turbo track use pura to defeat him by jumping and move in all turbos
and in oxide station do the same plus the shorcut(with n.trophy)
A2:
This one you will have to do some cheats. activate a cheat I don't know what it is but you activate it then you will always go fast and you will go 10 times faster when you go over a turbo thing.:)
A3:
Just use this character they are the one that I use to beat oxide:
N.trophy or Pinstripe -Answer by:adventureboy
A4:
Use penta
A5:
Beating Nitros Oxide is actually pretty easy, but you'll propably need cheats if you're not an expert player.
Here's a few cheats which might help you out:
Penta Penguin: Down, Right, Triangle, Down, Left, Triangle, Up
Super Turbo Pads: Triangle, Right, Right, Circle, Left
(**Note** This cheat is useful in some levels, sometimes this cheat does actually cause more harm if you're not carefull.)
Unlimited Turbos: Triangle, X, Right, Left, Left, Triangle, X
Hope this helps. :3
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Lords of Legend RPG 
How do you undo a cheat?
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