To perform the Hard Reset follow the following steps.
1. Hold the Volume Up and Power button simultaneously (for Samsung Galaxy devices, hold Volume Up + Home + Power).
2.Hold the button combination until you see the word Start (on Stock Android). Samsung devices will load straight into recovery mode.
3. Use Volume Down to scroll down to “wipe data/factory reset” and press the Power button to select it
4. Confirm your action and Reboot the device.
That's all.
- Thank You.