With Hard Reset you can fix some software problems. Attention!!! This will erase all your data!!!
Turn off the phone. Press and hold at the same time Volume UP,Home and Power keys. When you see Galaxy logo release the Power key but continue to hold the Volume Up key and the Home key.
Release them when the Android System Recovery screen appears. Use Volume Up/Down keys for navigation and Power On key for OK. Choose "wipe cache partition", "Yes -- delete all user data", "reboot system now".
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