1. Go to Settings app.
2. Scroll down and tap on “Additional Settings” (System settings).
3. Scroll down and tap on “Back up and reset.”
4. Tap on “Reset phone”.
5. Tap on “Erase all data”.
6. Tap on “Erase data”.
7. Tap again. Wait a moment until phone restarts. Once the reset is complete, all data might be deleted.
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