Here's a step by step instructions on how to hard reset the HTC Sensation 4G.
OS Android OS, v2.3 (Gingerbread)
CPU 1.2 GHz dual-core processor, Adreno 220 GPU, Qualcomm MSM 8260 Snapdragon
Precautions: This process will delete or wipe all data from the HTC Sensation 4G. Don't forget to
to have a back up copy of all your important files stored on the device before proceeding.
Factory Data Reset procedures:
1. On the main home screen, tap menu
2. Select Settings, then Privacy
3. Select Factory data reset
4. Select Reset phone
5. Enter the password if prompted, then select Erase everything.
If the HTC Sensation 4G is frozen: Reboot or restart the phone and do a hard reset through
1. Turn the power off. , take the battery out and reinsert it back again
2. Hold the Volume Down and Power Button
3. A menu will then show up such as Fastbook, Recovery, Clear Storage, and Simlock
4. Select Clear Storage by pressing the Volume Down button
5. Press and release the Power button
6. Select: Volume Up for YES and Volume Down for NO
Wait 'till the phone reboot, once the wipe process completes, the HTC Sensation 4G will then return to its original factory fresh state default settings.
All data including third-party applications will be deleted from the HTC Sensation 4G .So you may need to re-install it back again.