In order to hard reset a Samsung U450 DoubleTake, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Samsung U450 DoubleTake device will be brought back to the default configuration of a brand new device.
1. Press OK to enter Menu.
2. Continue to Settings & Tools, Phone Settings, Security.
3. Now type in your phone's lock code (it is the last 4 digits of your phone number).
4. Select Restore Phone, Yes. Press OK twice and select Yes.
5. Type in the phone's lock code once more. Press OK one last time.