In order to hard reset a Bird S667, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Bird S667 device will be brought back to the default configuration of a brand new device.
I. First of all, turn on the phone.
2. Second of all, tap in any one of these codes: *#77218114# or *#881188# or *#94267357# or *#9426*357# *#19912006# *#118811# *#3646633#
3. There is no third of all - the phone will now restart, and the hard reset will complete.