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.
Step 2: Access the option to reset to factory data.
Step 3: Select reset.
That completes the setup. Wishing you success.