In order to hard reset a Palm Treo 600, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Palm Treo 600 device will be brought back to the default configuration of a brand new device.
1. Pick up the stylus.
2. Press & hold the Power button. Now press the Reset button on the back of your phone.
3. Let go of Power button when the Palm logo appears.
4. Press Up button and select the language you want. Done.