Hard Reset / Factory Reset will restore your device to its initial state and will delete all your files. It is advisable to back up your important files before doing the reset process.
Factory Reset:
1. Switch on your device.
2. Go to Menu > Personal Option.
3. Select Backup & Reset > Factory Data Reset > Reset phone.
4. Accept previous option > touch once again option Reset phone.
5. Your device will reset to factory settings, and reboots.
Hard Reset:
1. Turn off your phone.
2. Press and hold together Volume Down + Power Button for 15 seconds.
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1. Switch on your device.
2. Go to Menu > Personal Option.
3. Select Backup & Reset > Factory Data Reset > Reset phone.
4. Accept previous option > touch once again option Reset phone.
5. Your device will reset to factory settings, and reboots.
Hard Reset:
1. Turn off your phone.
2. Press and hold together Volume Down + Power Button for 15 seconds.
3. Once Recovery menu appears on the screen, release the buttons.
4. Select "wipe data/factory reset" by using Volume buttons, and Power button to confirm.
5. Then choose "Yes -- delete all user data".
6. Confirm operation "reboot system now".