Today I went to mobile shop to ask about unroot my device Samsung Galaxy Tab3 10.1'. I told the owner of that shop about what's happened with my device. I asked him how much money if he can unroot for me? He said 150.000keep (around $20)lol. I thought to myself "Noway I will let you fool me with this expensive price" I can find how to handle this problem by myself on Internet even it must take a little long time but it's better than I've to pay him like this. :p