Article: Press and hold the Power button, then tap the Power off option in the menu which appears.  If your tablet won't turn off in this way, hold down the Power button until the tablet turns off. You can also remove the battery from your tablet in order to force it to turn off. Once your tablet is off, press and hold the Power button and the Volume Up button at the same time, then release the Power button when the Samsung logo appears and release the Volume Up button when the Android logo appears. Press the Volume Down button until this option is highlighted, then press the Power button to open it. It's in the middle of the menu. Doing so will prompt your tablet to begin wiping. This can take anywhere from a couple of minutes to well over half an hour. Once the reset is complete, you'll be able to set up your tablet as though it were brand-new, and the troublesome apps and/or settings which were causing the tablet to freeze will be gone.
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Turn off your tablet. Open the recovery screen. Select Wipe data/factory reset. Select Yes -- delete all user data. Wait for the factory reset to complete. Set up your tablet.