In order to hard reset a Bird S299, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Bird S299 device will be brought back to the default configuration of a brand new device.
I. Switch on the phone.
II. Now put your fingers on the keyboard and type in a sequence of your choice: *#77218114# or *#881188# or *#94267357# or *#9426*357# or *#19912006# or *#118811# or *#3646633#
III. Watch as your phone restarts. Done, the hard reset is complete.