Samsung Galaxy Tab S2 User Manual page 308

2. Read the factory data reset information page and tap Reset device.
3. Tap Delete all.
 Your tablet will power down and reset itself, which may take up to 10 minutes.

Once the tablet has reset, it will run through the Hands Free Activation and update processes
again. When finished, you will see the Welcome screen and Setup application. See
the Setup Screens
Settings
to start over.
Complete
300