In order to hard reset a HTC Hero, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
HTC Hero device will be brought back to the default configuration of a brand new device.
1. Lets get started. Begin by pressing the Power button to turn your phone on.
2. Now press and hold the Power and End Call buttons for five seconds.
3. Your phone will now reset and restart. The hard reset process is complete.