Resetting to factory settings allows you to restore all tablet settings to the manufacturer's default.
Note: All data (images, contacts, messages...) will be lost. Delete Gmail accounts before resetting.
Here's how to reset Itel S31 to factory settings:
Step 1: Navigate to backup & reset in settings.
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Step 2: Access the option to reset to factory data.
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Step 3: Select reset.
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That completes the setup. Wishing you success.