Hard Reset SAMSUNG                Galaxy S6

1 .  At the beginning switch off the cell phone by pressing the Power button.
 2 .      Afterwards press and hold together: Volume Up + Home + Power                                    button, until you see Samsung logo.
 3 .    Then select from Recovery Mode menu "wipe data / factory reset"                     using Volume buttons to navigate and Power button to confirm.
4 .   Choose "Yes -- delete all user data" to confirm the whole operation.
5 .  After that select option "reboot system now".
6 .  Well done! The hard reset has just been performed.

Samsung A7  Factory Reset passcode unlock

                           full tutorial ..........