Acer Iconia Talk S A1-724 - Manual (Page 46)

46 - Advanced settings
Resetting your tablet
A clean boot restores your tablet to the factory settings.
To perform a clean boot, open Settings from the application menu,
then tap Backup & reset > Factory data reset; click Reset tablet
and then Erase everything to format your tablet.
Important
This will erase all your personal information, any contacts stored on
your tablet and any programs you installed.