Hard Reset SAMSUNG M919 Galaxy S4

1. Remove and insert the baterry.
2. Then press and hold together Volume Up + Home button + Power button.
   
3. Next release this buttons when you see logo Samsung.
4. Now using Volume down select the option "wipe data/factory reset" and confirm withPower button.
   
5. Select "yes" with Volume Down and confirm with Power button.
   
6. If the operation is completed, select "reboot" option, and wait until phone restarts.
   
7. That's it.

WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.