HTC 8XT hard resetPerforming a factory reset using phone buttons
If you can’t turn your phone on or access settings, you can still perform a factory reset by using the phone's buttons.
Turn the power off.
Press and hold the VOLUME DOWN button, and then briefly press the POWER button. Release the VOLUME DOWN button when you see an icon on the screen.
Then press the following buttons in this order: VOLUME UP > VOLUME DOWN > POWER > VOLUME DOWN.
The most convenient way to do a factory reset is via the settings.
On the Start screen, slide to the left.
Tap Settings > about.
Tap reset your phone, and then tap yes.