In order to hard reset a Palm Treo 650, 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 650 device will be brought back to the default configuration of a brand new device.
1. Remove the battery from the phone.
2. Press-hold the Power button and put the battery back in.
3. Palm logo will appear on-screen. When it does, let go of Power button.
4. An "Erase all data?" message will appear on screen. Press Up to confirm it.
5. Lastly, select OK. That is all.