In order to hard reset a Samsung Galaxy Y Duos S6102, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Samsung Galaxy Y Duos S6102 device will be brought back to the default configuration of a brand new device.
1. Switch off the phone by press-holding the Power button.
2. Press and hold the Volume Up + Power + Home buttons until the Samsung logo pops onscreen.
3. A new menu should now open. From it, select the Wipe data/factory reset option. To do so, use Volume buttons to scroll the menu and Power button to choose the option.
4. Now select, in the same way as above, Yes and Reboot system now.
5. Done!