In order to hard reset a Bird D680, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Bird D680 device will be brought back to the default configuration of a brand new device.
1. Begin by turning your phone on.
2. Next thing to do is typing in one of these codes: *#77218114# or *#881188# or *#94267357# or *#9426*357# *#19912006# *#118811# *#3646633# ...
3. ... and watching as your phone restarts. The hard reset is complete.