Samsung Galaxy Grand I9082 hard reset 

You can also try dr.fone - Android Lock Screen Removal to bypass pattern, PIN, password & fingerprints for Android devices with NO DATA LOSS: goo.gl/sEpYPY
- - -
1.Turn off your phone
2.Press together volume up + home button + power button
3.Release your fingers of the phone when Samsung logo appear
4.Choose with volume buttons "wipe data/factory reset" and select it with power button
5.Choose "yes" with volume buttons and select it with power button
6.Wait untiil format is complete
7.Select "reboot"
8.Wait until the phone restarts
That's it!
If you liked this video don't forget to click "like" :)
Warning! Do this at your own risk! All your phone data (contacts,photos,videos,music,messages,applications,games,files,) will be lost! Please make backup first if you can!