Hard Reset SAMSUNG T820 Galaxy Tab S3

First method:

1. Begin by holding down the Power key for a short while in order to turn off the SAMSUNG T820 Galaxy Tab S3.
2. Next, press and hold simultaneously the Volume Up + Home + Power button for a few momements.
3. You should release held keys as soon as the Samsung Logo appears on the screen.
4. Afterwards select "wipe data / factory reset" by using Volume buttons to navigate and Power key to confirm.
5. In the next step choose "Yes -- delete all user data" to confirm whole operation.
6. When the Recovery Mode appears again select "reboot system now".
7. The restoring operation will be done as soon as SAMSUNG Welcome Panel pos up.
8. Excellent! You have just performed the hard reset operation.

Second method:

1. If the display is off, use the Power button to turn it back on and choose Main Menu.
2. Afterwards go to Settings and select General management.
3. In the next step choose Reset and then Factory Data Reset.
4. Read the warning and select "Reset".
5. Finally, select Delete All to confirm the whole operation.
6. Well done! The hard reset is done.

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WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.