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1. Connect with WiFi.
2. Go to the email page where you need to put previous Gmail.
3. Now write something and highlight the text by long touch.
4. Touch the swipe button of keyboard and move your finger towards latter "S".
5. Try until the search page open.
6. write "setting" on search bar
7. Select setting option.
8. go to backup and reset and finish the reset process according to video.
9. You are done, Enjoy your phone again.