In order to hard reset a Amoi CMA8170, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Amoi CMA8170 device will be brought back to the default configuration of a brand new device.
2. Type in one of these codes: *#94267357#, *#9426*357#, *#19912006#, *#77218114#, *#881188#, *#118811#, *#3646633#.
3. Wait until your device restarts.