I have synced the 820 with my Garmin Connect app and the 820 is detected through Garmin Express. However, every time I try to update Routable Cycle Map (2020.10), GPS Software (2.50), and Time Zone Map I get an error message with no explanation.
Additionally, when trying to update my Varia UT800 software from 2.40 to whatever the current version is....nothing ever happens and the only status I see on the light sensor page is "checking for updates". 0 for 2 in the update department.