I'm too. But when I changed the computer (using Windows 7) and installed fresh driver on it, it's works. It's take about 5 minutes for flash17/059/2014 19:59:39 - INFO - Checking header
17/059/2014 19:59:39 - INFO - Flashing data
I can root the phone with 4.4.2 firmware using this method in the thread http://forum.xda-developers.com/t2-ultra/general/root-t2-dual-4-4-t2818887As of now, there is no point in rooting as Sony has enabled their Runtime Integrity Check in our kernel which prevents mounting /system as rw. I'm waiting for the kernel sources to be released and then it won't be much of a problem.
The SuperSU need update, but I ignore it, it's works for me
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