I have been waiting to root to the latest Sony Xperia Z firmware Kitkat but I found procedure is quite complicated. Well, I found another way to root KitKat using TowelRoot App, but it only works for firmware before 3-Jun-2014. I compile this guide so that owner of Sony Xperia Z can enjoy too.
I wrote an article to create FTF and now this article will show you how to flash FTF using FlashTool. Please read through my WARNING message before you start flashing FTF.