It will remove all the data ,contacts and apps that you installed
Power on the tablet.
Next goto Menu -> Settings -> Backup & reset -> Reset device -> Erase everything.
Then wait until your device will reset and reboots.
Turn off your cell tablet.
Now press and hold Volume Up + Home button + Power button.
After few seconds you will see Recovery mode menu.
From this menu choose option "wipe data / factory reset" using Volume buttons to scroll and Power button to confirm your choice.
Next select option "Yes -- delete all user data".
Then accept option "reboot system now".
Samsung Galaxy Tab T311 Restore Factory Hard Reset Format Phone.So lets start the Samsung Galaxy Tab T311 Restore Factory, Samsung Galaxy Tab T311 Hard Reset.Turn Off the mobile phone for few mints.Samsung Galaxy Tab T311 Remove Pattern Lock.
Hard Reset,Restart Problem,Restart Solution,Restore Factory,
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.