HTC 8X - Manual (Page 93)

Performing 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.
1. Turn the power off.
2. 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.
3. Then press the following hardware buttons in sequence: VOLUME UP >
VOLUME DOWN > POWER > VOLUME DOWN.
93 Update and reset