Acer A3-A20 User Manual - Page 42
Updating your tablet’s operating system, Resetting your tablet, Settings, About tablet, System - firmware
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42 - Advanced settings You can delete an alarm by tapping tapping UNDO. . This action can be undone by Updating your tablet's operating system Your tablet can download and install system updates, adding support for new devices or expanding software options. To check for updates, tap APPs > Settings > About tablet > System updates > Check now. Note Downloading new firmware can take up to 40 minutes, depending on your network speed. Do not press the power or reset button or access your tablet in any way during a system upgrade to prevent firmware installation failure. Resetting your tablet A clean boot restores your tablet to the factory settings. Important This will erase all your personal information, any contacts stored on your tablet and any programs you installed. 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.