Hard Reset SAMSUNG T239M Galaxy Tab 4 Lite 7.0" 4G LTE

First method:

1. In the first step switch off the device with Power key.
2. Now press and hold three keys: Volume Up, Home and Power button for a short of while.
3. When Samsung Logo pops up on the screen release keys.
4. Now you should be in Recovery Mode. Choose "wipe data / factory reset" by using Volume buttons to scroll down and Power key to accept your choice.
5. Now choose "Yes -- delete all user data". Use the Volume keys  to navigate and Power button to confirm this.
6. At last just select "reboot system now".
7. Great!

Second method:

1. Turn on your device by holding Power button for a couple of seconds.
2. Now go Settings -- > Backup&Reset -->Factory Data Reset --> Reset Device.
3. Tap on Erase Everything and choose OK to begin the proces. 
4. Well done! This operation will be completed for a couple of seconds.

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