If you somehow forget the pattern, PIN, or password and lock your Samsung Galaxy Tab 2, you might be locked out forever. But it's not entirely impossible to break into a locked device and reset the secured lock screen. Without data loss!

http://goo.gl/XafCEn

Works fine with Samsung Galaxy Tablets:
Samsung Galaxy Tab 2 (7.0)
Samsung Galaxy Tab 2 (10.1)
Samsung Galaxy Tab Pro (8.4)
Samsung Galaxy Tab Pro (10.1)
Samsung Galaxy Tab S (8.4)