Hi. Phina2013
Simply follow the steps below to reset your Acer Iconia B1-711
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Right from the Apps menu, tap on Settings > and then tap Backup & reset.
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Tap on "Factory Data Reset" > and then tap "Reset Tablet".
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Tap "Erase Everything" to format your tablet back to factory default configuration.
To locate the reset button in case you cannot access the device's Operating System to perfom a Factory Data Reset via Software Menus, Acer recommends the referencing to the tablet model's User Manual.