Thankfully, I didn't have this type of issue, but I will give my experience, new Note 3. I plug in my Note 3 with USB, (kitkat) the pc reacts, but it is only charging. I figure out that I need Kies, I download it, still can't see the phone. I had an extension USB removed it and then Kies said, I needed version 3, it downloaded itself and then I could see the phone. Shortly, Windows tells me that there was an update, I checked and it was something for a Samsung. I told it to install it and it failed 2-3 times. By this time the phone had gone to sleep or I had disconnected it don't remember, but I hook it backup with Kies3 and the update installs correctly. Hopefully this helps someone.