I went upgrading from Jelly Bean to KitKat 4.4.2 on my Note-3 (T-Mobile), and since upgrading, the Note-3 no longer transfer data at USB 3.0 speed anymore, only regular 2.0 speed. i tried using new 3.0 cables, still the same issue, and my other 3.0 devices work in the USB 3.0 port on my computer with no problem. And on my phone, even the menu choice for 3.0 no longer shows as a third optioned. i downloaded and install Kies 3 and the USB drivers from Samsungs website, but still the same problem. just wondering if anyone else has experience the same with there Galaxy Note-3 after upgrading to KitKat.