In order to hard reset a Lenovo A660, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Lenovo A660 device will be brought back to the default configuration of a brand new device.
1. Lets get started. Begin by pressing the Power button to turn your phone off.
2. Now press and hold the Power and Volume Up buttons for five seconds. Let go of these buttons when an Android image shows on screen.
3. Select the wipe data/factory reset option. Use Volume buttons to scroll and Power button to select.
4. Using the same method as above, select Yes and reboot system now.
5. The hard reset process is complete. Congratulations.