In order to hard reset a Samsung Google Nexus S, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Samsung Google Nexus S 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 buttons until the new menu opens.
3. Using Volume buttons to navigate to it and Power button to select it.
4. Android icon will appear on-screen. When it does, press the Volume Up and Power buttons simultaneously.
5. Now choose Wipe data/Factory reset option.
6. Next, select Yes and Reboot system now.
7. Yay, the hard reset process is complete.