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If only you contacted me right after you had this problem, I’d be able to advise you the steps on how to revert your notes back to the unedited state.
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Shake to undo is the only thing that might work.

Been there done that.
I was about to say that. Shake to Undo is the only way to revert your notes back to the unedited state. If only you did not exit out from the notes app.
 
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