You will not be able to save the dirt you are trying to dig up on your ex. If that's the case plug it in to your pc and extract the dirt (info) then factory reset. Otherwise no one on xda will help you bypass a pin or password it's in ethical. And not allowed.
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Plus if you're done with her and over her then you shouldn't care.
You can tell when one still cares if they have an opportunity for revenge and take it or not.