Samsung Galaxy Tab 3 - Rooting Problems

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I have just rooted my Samsung tab 3 with Kingo Android Root app that I found off of a youtube rooting tutorial. I followed all the steps perfectly and now my tablet wont work, like when I turn it on, it wont do anything, it will just pause at the Samsung GALAXY TAB 3 screen and stay there forever. could you help me with this? My device name is GT-P5210

This is the tutorial link
How to root Samsung Galaxy Tab 3 (SM-T217S) - YouTube