Acer S100 - Manual (Page 55)

55 Resetting your smartphone
Warning! You should only remove programs if you are familiar
with the Android operating system.
Obtaining and installing applications
Your smartphone uses the open-source Android platform. To
obtain and install applications for your smartphone, you can
tap Market on the home screen to open the Google
marketplace.
Note: This requires a Gmail/Google mail account.
Resetting your smartphone
You may have to perform a reset if your smartphone fails to
respond when buttons are pressed or the screen is tapped.
Note: Before performing a reset, ensure that your smartphone is
not locked. Press any key or tap the screen to see if the phone
responds.
Clean boot
Warning! You should only perform a clean boot when all other
options have failed to restore your smartphone to an operational
state.
A clean boot will restore your smartphone to the factory
settings.