Solution Steps

1. Back up important data first (photos, contacts, etc.).
2. Settings → System → Reset options → Erase all data (factory reset).
3. Enter PIN, password, or pattern to confirm.
4. Tap "Erase all data" or "Factory reset".
5. Wait for phone to reset and restart.
6. Alternative: Boot into Recovery Mode → Wipe data/factory reset (varies by manufacturer).
7. Phone will restart to initial setup screen.