Hard Reset SAMSUNG P5200 Galaxy Tab 3 10.1 3G

First method:

1. Check that your phone is on.
   
2. Next from the Home screen press Menu -> Settings -> Backup & reset -> Reset device ->Erase everything.
3. Confirm your choice, and wait to finich operation.
4. That's all.

Second method:

1. Press Power button, until your tablet is off.
   
2. Now press and hold together:  Volume Up + Home button + Power button, until you seeRecovery mode.
   
3. Then select "wipe data / factory reset" using Volume buttons to navigate and Power buttonto confirm operation.
   
4. Next choose option "Yes -- delete all user data".
   
5. After that confirm option "reboot system now".
   
6. Well done!

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