In order to hard reset a Palm Centro, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Palm Centro device will be brought back to the default configuration of a brand new device.
1. Pull out the phone's battery, then put it back in.
2. Press'n'hold Power button when the Palm logo pops on-screen.
3. After a moment, the status bar at the bottom of the screen should fill and disappear. When it does, let go of the Power button.
4. Confirm the "Erase all data?" option by pressing Up.
5. Lastly, select the language you want with a Center button.
6. Voila, the hard reset process is now complete.