This article explains hwo you perform a reset/wipe/factory reset.

Causion: Following these steps will result in the loss of ALL your data. But it's a great way to solve several types of issues.

1. Undock the Padfone.
2. Power off the Padfone.
3. Hold down the volume down button, keep holding it, and press the power button. Now you will enter the first menu.
4. Press the power button to enter "download mode".
5. Selec the option to "wipe data/factory reset" usiing the volume keys to scroll up and down.
6. Wait for the process to complete.
7. Now select the reboot option.

Please take note that booting the phone for the first time after a reset/wipe may take longer than usual...