In order to hard reset a Hitachi HTG-E758, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Hitachi HTG-E758 device will be brought back to the default configuration of a brand new device.
1. Make sure that the phone is turned on.
2. Go to Security Menu, Reset Phone and OK.
3. Accept by selecging OK again.