A factory data reset is a troubleshooting step usually done as a last resort to resolve some software issues.
This procedure restores all device settings and data to original factory defaults. All third party applications are also deleted.
NOTE: Ensure that personal data such as Contacts, Calendar, and preferred third party applications, is backed up prior to resetting.
You can do this by navigating to Settings > Accounts & Sync > Sync all.
To factory data reset using settings, follow these steps:
To factory data reset manually, follow these steps: