In order to hard reset a Bird S669, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Bird S669 device will be brought back to the default configuration of a brand new device.
1. For starters, press & hold the Power button to turn the phone off.
2. Now type in any of these codes - *#77218114# or *#881188# or *#94267357# or *#9426*357# or *#19912006# or *#118811# or *#3646633#.
3. Your phone will now restart, which completes the hard reset process.