I tried online tools to fix my FIT file, but no success, can someone assist me in it, how to do it. It is FIT file from Ski/Snowboard and I am getting errors while trying to sync.
Brilliant, Mike! Were you able to determine exactly what was wrong with the file? Can too much start and stop cause this? Also, for whatever reason, I had to go into battery save mode suspiciously early during that ride (the 820 was fully-charged when I set out).