In order to hard reset a CHANGHONG F2, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
CHANGHONG F2 device will be brought back to the default configuration of a brand new device.
1. Power up the phone.
2. Now type one of these codes into the phone: *#881188# or *#94267357# or *#9426*357# or *#77218114# or *#118811# or *#3646633#. Phone should now reset and restart.