In order to hard reset a HTC S740, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
HTC S740 device will be brought back to the default configuration of a brand new device.
1. Start by connecting your phone to a power source and turning it off.
2.Now press and hold the Nav-Button & Volume Downn button.
3. As you hold the above buttons, press the Power button.
4. Release all held buttons when the white screen appears.
5. Press the Volume Up button to confirm the hard reset process. Voila, the hard reset is complete.