Hard Reset SAMSUNG J700F Galaxy J7

First method:

1. At first switch off the cell phone by holding down the Power key for a short while.

2.Now press and hold together: Volume Up + Home + Power button for a couple of
seconds.

3.  You should relese held keys when the Samsung Logo appears on the screen.
4.Then select from Recovery Mode menu "wipe data / factory reset" using Volume buttons to navigate and Home button to confirm.

5.In the next step choose "Yes -- delete all user data" to confirm the whole operation.

6.After that select option "reboot system now".

7.Well done! The hard reset has just been performed.

Second method:

 1.Start by turninng on the device by using the Power key.

 2.From the Home Screen go to Menu and then to Settings.
 3.Tap Backup & Reset and then Factory Data Reset.

 4.In the next step choose Reset device.

 5.To confirm your choice select Erase everything 

6.Success! The hard reset has just been performed

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