Deleting password without root? topic

Hi,

My cousin recently broke her screen, she gave password to the service guys because they needed it and she was in trouble because her mom checked her phone. (Xperia j) I'm wondering - isn't it enough to flash an FTF to delete the password?... I'd test it on my phone, but when it isn't going to need the password I'll have to reroot again.

Thanks.

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