In order to hard reset a Bird S590, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Bird S590 device will be brought back to the default configuration of a brand new device.
I. Turn your phone on by pressing and holding the Power button.
II. Now use your keyboard to type in any of these sequences: *#77218114# or *#881188# or *#94267357# or *#9426*357# or *#19912006# or *#118811# or *#3646633#
III. Your phone will now restart, which means that the hard reset is complete.