I've tried the kiesewetter and fitfileinfo sites without any luck with what I think is a corrupt FIT file.
After my MTB ride today the Garmin 520 powered off (although there was plenty of battery). After I turned it back on I could not get it to sync with the Garmin app on my phone so connected the device to my computer tonight and saw the FIT file from was there, but when importing on Garmin Connect it says "One of your files was not accepted by the system.".
I've attached the FIT file. Thanks in advance if anyone can assist!
