It will remove all the data ,contacts and apps that you installed
Power off tab 2 completely.
Press and hold power button and volume up together.
With volume up and down keys select Wipe Data/ Factory Reset.
Press Power key to enter
Select yes delete all data
Then reboot tab 2
Samsung Galaxy Tab 2 P3100 Restore Factory Hard Reset Format Phone.So lets start the Samsung Galaxy Tab 2 P3100 Restore Factory, Samsung Galaxy Tab 2 P3100 Hard Reset.Turn Off the mobile phone for few mints.Samsung Galaxy Tab 2 P3100 Remove Pattern Lock.
Restore Hard reset will set your phone in origional factorry settings. It will remove all the data and apps that you installed. Your contacts will be removed and you have to add them again.