Paste it here. Every key you pressed was right — only the layout reading them was wrong. This re-reads them through the other one.
This only undoes a wrong-layout mistake — it maps key positions, so "hello" becomes "اهممخ" because those are the same physical keys. It deliberately does not transliterate: it will never turn "marhaba" into "مرحبا". That's a different problem, and mixing the two makes both worse.