You can also try dr.fone - Android Lock Screen Removal to bypass pattern, PIN, password & fingerprints for Android devices with NO DATA LOSS: [ Ссылка ]
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This method is called HARD RESET and will reset your Samsung Galaxy Ace S5839i to factory settings by using a keys combination without requiring the phone to be power on. Use it if you forget your code, password, pin or pattern, if you have blocked your Google account (too many pattern attempts) or if you have various problems with the phone software.
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This method will not upgrade or downgrade the firmware version of your Samsung Galaxy Ace S5839i and it will NOT UNLOCK the network lock. This method does not reset the PIN code of the SIM card. If your phone has been ROOTED this method will NOT UNISTALL the ROOT.
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Warning! You do this at your own risk! 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!
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1.Power off your phone
2.Press together volume up + home key + power button
3.Choose with volume buttons "wipe data/factory reset" and select it with home button
4.Choose "yes" with volume buttons and select it with home button
5.Wait untill format ends
6.Choose "reboot"
7.Wait until the phone restarts
That's all

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