I have two Galaxy Note 2's. One is using Android 4.3, and the other 4.1.2. The 4.3 will not connect to Keis 3. Ver 4.1.2 will not connect on Keis 2. I have tried clearing phone cache, different cables, all available usb ports on two different computers (Win 7x64), Safe Mode, firewall/virus off. Prior to updating my phone to Androids 4.3, under 4.1.2 it did not connect to Keis 2. I thought updating the phone and trying Keis 3 might help, it did not. Using ATT.