We can unlock pattern lock on Samsung Glaxy Tab 2 P3100 with simple trick. If you have problem like slow speed or hang during working time on tab then this problem also solved by this method.
Note: Take backup of important data because it will remove all data on device.

How to hard reset Samsung Galaxy Tab 2 P3100:
  1. Power off tab 2 completely.
  2. Press and hold power button and volume up together.
  3. With volume up and down keys select Wipe Data/ Factory Reset.
  4. Press Power key to enter
  5. Select yes delete all data 
  6. Then reboot tab 2

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