Before you give your handset to repair  shop or buy new handset, please try the following procedure to repair  your device. First charge your battery more then 70%, backup your  important data like phonebook, message, email, images and settings and  in most cases take out SIM card and SD card. After doing hard reset not  possible to recover your data, so online backup is always important. For  all of your data, a backup should be done on a external device, hard  drive, raid system media or SD card. 
Hard Reset: 
       
    
 
 
          
      
 
  
 
 
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