Before you give your handset to repair shop or buy new handset, please try the following procedure to repair your device. First charge your battery more then 70%, backup your important data like phone-book, message, email, images and settings and in most cases take out SIM card and SD card. After doing hard reset not possible to recover your data, so online backup is always important. For all of your data, a backup should be done on a external device, hard drive, raid system media or SD card.
How to Hard Reset HTC Harrier
If your device responds slowly, stops responding or freezes, try performing a soft reset. A soft reset causes the device to restart and re-adjust memory allocation. Unsaved data in open windows may be lost.
Use the stylus to press and hold the Reset button.
Press and Hold the Power Button and use the stylus to press the soft button at the same time.