I just flew my Phantom 2 V2 yesterday with no problems. Now I think I want to upgrade. In an earlier post, I saw when I needed to download Assistant, there was something like 3.6 and 3.8. I was told to start with 3.6 and do some test flights. Now what will happen if I down load 3.8? Is it basically the same (but with "fixes"), or is there more calibration involved? What about NAZA-M? Is it the same in 3.6 and 3.8 ( NOTE: I have not set my Phantom up in NAZA-M yet). I don't want to download or change anything and end up regretting it. I just want to understand what I am getting into. Let's say for arguments sake... I download 3.8 and do some calibration and run into trouble. Can I go back to 3.6 and redo everything?