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How to root a samsung galaxy tab 4 
Create a backup of your entire data on the galaxy tab 4, so that you are able to restore everything after the rooting procedure meets its end. 
Navigate through the settings mode. 
Enable the usb debugging mode from the developer option available in the menu.
Make sure your computer comprises of all the drivers for the tablet to ensure smooth rooting process. Some computers come with a security option that might obstruct the rooting process.