In order to hard reset a Garmin-Asus nuvifone M20, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Garmin-Asus nuvifone M20 device will be brought back to the default configuration of a brand new device.
1. Power up the device.
2. Now press the Start Menu button.
3. Enter Settings > System > Default Settings.
4. Type in 1234 and press OK.
5. Done! Your phone will reset'n'restart now. Grats.