UPDATED:
You can download Samsung's Smart Switch for PC and phone. I use it like Blackberry Desktop to back up my phone and Sync it to Outlook.
It also has a Software Update feature which I am using right now to download the 6.0 Update. Been at it about 15 minutes now and I am at 85%. Will advise how it goes.
I neglected to mention that I was using Samsung Smart Switch on my PC, connected to the phone via my Samsung oem USB cable.
The OS update failed to run the first couple of times, something about a connection error(?), so I followed the instructions given and held the Power and Volume Down buttons for 10 seconds, which brings up a menu. Unfortunately it did not tell me what to do after that, but I (decided to try) chose Safe Mode and restarted the phone. Ran the update again and it came off without a hitch flawless and perfect. Now to find out all that is new.
I hope your upgrade goes as well or better.
BerryInteresting...