For Hard reset Samsung S5780 Wave 578 use following steps
1. Before Hard Reset (reset to factory settings), turn off your smartphone
2. Press simultaneously and hold for a few seconds the 2 buttons Volume up and Power
3. The keys after the SAMSUNG logo appears on the screen, you can release
4. Recovery Mode, opens after pressing the Volume Up and Power buttons
5. In the menu, go to the line "wipe data / factory reset", the Volume Up / Down keys are used to navigate the menu, and the Power key to confirm the choice made
6. Select the line "yes" and press the Power button
7. We are interested in the menu item "reboot system now"
8. Smartphone hard reset done
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