Just got my 830 last night. I have been using the Edge 1000 for several years. I copies over the Setting.fit, records, sports and some other and dropped in the NEWFILE folder. All of the bike profiles, records and most of the settings came accross with only a few tweaks to the profiles. The sensors are another issue. Nothing listed in the sensor list, so I tried to read them but none would read. (Speed, cadence and DI2). I tried 3 other bikes and the 830 would not read them. But, when I was spinning the wheels and clicking the DI2 gear, it would pop up that if found some of the other sensors, under the names from the Edge 1000. But still nothing listed under sensors. I finally added a couple sensors manually by using the sensor# from the Edge 1000 and they seem to work. But I was getting "Duplicate Sensors" and the same Sensor name. I was down the street away from other bikes so it was not an issue with reading another bike.
I had software version 3.5 last night and upgraded to the Beta 3.55 today with the same result.
I was going to delete the FIT files that keeps the Sensors and just read them one by one, but I'm not sure which FIT file they are stored in.