I have been trying to update my edge 520's software for weeks now. When I connect the Garmin to my PC and then sync it through the Garmin Express Application, a message comes up saying that re-authentication is required. In the background the sync stops. When i type in the correct fields for username and password (has been triple checked and even used to log on the website app) it tells me that it "There was a problem connecting to Garmin servers", and every time it says that the servers are down. This would never happen to me before. I have tried different WiFi networks as well, but that doesn't seem to change anything. This is not letting me sync my Garmin Edge 520 and update it. :(
PLEASE HELP