In order to hard reset a HP iPAQ rw6815, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
HP iPAQ rw6815 device will be brought back to the default configuration of a brand new device.
1. First, turn off the phone.
2. Second, press and hold Power, End, Send and Reset buttons for five seconds.
3. Release held buttons. Your phone should now reset and restart. Grats.