Just bought my Edge 510 a couple days ago and took it out riding yesterday. I uploaded the data to my phone and strava just fine but when I went to upload it to Connect I got the Internal Error message. I tried it manually as well, and I also did a fixfit. file and that didn't work either.
I tried again today and nothing is working. Getting pretty ticked off. You pay this much money there shouldn't be issues like this.
Can anyone help????