You can also use dr.fone - Android Lock Screen Removal to bypass Android lock screen pattern, PIN, password & fingerprints with NO DATA LOSS: https://goo.gl/2gv9HT
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This method will reset your Lg Leon 4G LTE H340n to factory settings. Warning! You do this at your own risk! Make sure your phone battery is fully charged! Take your sim card and memory card from the phone before the reset. All personal data from the phone (contacts, pictures, messages, apps, games, files) will be deleted! Please, if you can, make a backup before!