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puthy

Last week, i decided to sell my beloved Xperia SL because i want to buy Xperia Z. I did back up all my personal data such as photos, music, doc to my laptop via USB connection ( I don't care about apps). Then I went to Menu => Settings => Back up and Reset => Factory data reset => and I checked the box say "Erase internal storage" => Reset phone. Honestly, after performing that reset, i didn't check the phone again to make sure whether all the data had been gone or not. I sold the phone right away. Days later, I reallized that carelessness. I might have left some confidential document in that phone. My question is "Will the reset steps i described completely erase all kind of user's data?" I do worry about this. My phone is rooted, for that time i needed to install my own language. I'm so grateful for your answers and sorry for my poor english