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If you made a bad script, then make a new script and make sure you check for free space before selecting the offset.
If stuff that's corrupted is separate from the text you added, then you have to start over. Because your script overwrote something else,
and there's no way to just remove something you've already compiled.
excepting the case you know exactly what it looked like before your change and where it was compiled to, and you have an extra untouched rom copy.
In that case you can copy paste the hex back to the way it was with a hex editor.
If you don't know what I'm talking about, it doesn't apply to you, and you're better off just starting over from a clean rom.