SAMSUNG M919 Galaxy S4 Hard Reset

First of all Remove and insert the baterry.
Then press and hold together Volume Up + Home button + Power button.

Next release this buttons when you see logo Samsung.
Now using Volume down select the option "wipe data/factory reset" and confirm withPower button.
Select "yes" with Volume Down and confirm with Power button.
If the operation is completed, select "reboot" option, and wait until phone restarts.
Well Done!