Acer A700 用户手册

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If your device is not responding to screen input
To reset your device use a small thin object (such as a paperclip) to press the 
recessed reset button.
Restoring to factory settings
Open Settings from the application menu, then tap Backup & reset > Factory 
data reset
; tap Reset tablet and then Erase everything to format your tablet.
Updating your tablet’s operating system
To check for updates, tap APPS > Settings > About tablet > System update > 
Check now.