In order to hard reset a Orange San Diego, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Orange San Diego device will be brought back to the default configuration of a brand new device.
1. Switch off the phone by holding down the Power button.
2. Press Volume Up and Power buttons at the same time.
3. Release held buttons when the Android logo appears on-screen. Press and hold Volume Up + Power.
4. A new menu will appear. From it, select Recovery.
5. After a new menu opens, select wipe data/factory reset - Volume buttons navigate the menu, Power button selects options.
6. Using the same method as above, select Yes and Reboot System Now.
7. That is all. Done.