Samsung GT-P7510FKYXAR - Manual (Page 20)

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2. Swipe across the screen as shown.
The last screen you accessed displays.
Note: You can customize the Lock screen and set the type of
Screen Unlock you want to use (Pattern, PIN, or
Password). For more information, refer to “Security” on
page 186.
Troubleshooting
If your device has fatal errors, hangs up, or freezes, you may
need to reset the device to regain functionality.
Ⅲ If your device is frozen and unresponsive, press and
hold the Power/Lock Key for at least 20
seconds.