Hard Reset SAMSUNG T116 Galaxy Tab 3V

First method:

1. First of all turn off your device by holding the Power key.
2. Then press and hold together: Volume Up + Home button + Power button.
3. You should release held keys when an Android Icon appears on the screen.
4. Select "wipe data / factory reset" using Volume buttons to navigate and Power button to confirm.
   
5. Afterwards choose "Yes -- delete all user data" to confirm whole operation.
6. In order to restart the device select "reboot system now".
7. Well done!

Second method:

1. At the very beginning switch on the tablet.
2. Afterwards go to Settings and then to Backup & reset.
3. Tap Reset Devive. 
4. Choose Erase Everything if you are sure you want to clear all your data. 
5. Select OK to confirm the whole operation.
6. Well done!

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