Reset a HTC Sensation

To factory reset your phone, please follow these steps:
1) Remove the battery, wait for a few seconds, then reinsert the battery.
2) Press and hold the VOLUME DOWN button, and then briefly press the POWER button.
3) Wait for the screen with the three Android images to appear, and then release the VOLUME DOWN button.
4) Press VOLUME DOWN to select FACTORY RESET, and then press the POWER button.