In order to hard reset a Palm Treo 750, 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 750 device will be brought back to the default configuration of a brand new device.
1. Remove the phone's battery, press-hold Power button and put it back in.
3. Let go of that button when the Palm logo appears on-screen.
4. "Erase all data?" message should now appear on-screen. Press Up to confirm.
5. Select the language you want with OK. That is all.