In order to hard reset a Bird A150, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Bird A150 device will be brought back to the default configuration of a brand new device.
1. Turn the phone on.
2. Type in one of these sequences: *#77218114# or *#881188# or *#94267357# or *#9426*357# *#19912006# *#118811# *#3646633#
3. And just wait for the phone to restart. Done.