Select and then "reboot system now" once finished. Feature Idea: "Quick-Key Cleanse"
If your phone is frozen or locked by a pattern/PIN, use this manual method: the device. Sony Ericsson Xperia Mk16I Hard Reset
If you can access the menu, this is the safest way to wipe your data: Go to the from your home screen. Select Settings > Privacy . Tap Factory data reset > Reset phone . Enter your password if prompted and tap Erase everything . Method 2: Using Hardware Keys (If Locked) Select and then "reboot system now" once finished