In order to hard reset a aigo M89, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
aigo M89 device will be brought back to the default configuration of a brand new device.
1. Power up the device.
2. Starting from the Menu, go to Settings > Backup & Reset > Factory data reset > Reset Phone > Erase Everything.
3. After the phone resets and reboots, the hard reset process will complete.