Asus A639 Soft reset
Reset switch - allows you to perform a soft reset in case the device malfunctions, or when an application hangs. Press the tip of the stylus on this switch to reset the system.
Asus A639 Hard reset
To perform a clean reset, press and hold the Speak button while simultaneously pressing the
Mode Switcher button and pressing the stylus on the reset switch.
Then a warning message appears. Press to do clean reset, or press to leave the operation screen.
Performing a soft reset will not change the data in the device; while performing a clean reset will delete all data.