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 happening with my device. I asked him how much money if he can unroot for me? He said 150.000kip(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 even it must take a long long time but better than I've to pay him like this.