Invalid Activity File - My first ultra triathlon!

Former Member
Former Member
Hi All,

Yesterday I did my first Ultra distance triathlon and the activity file on my Garmin Fenix 5 wouldn't sync with the mobile connect app. When I connected the watch to Mac via Garmin express, it says that the activity file is invalid. (The same thing happened to me with a swim about a month ago). All the details of the race still show on the watch itself.

Does anyone have a solution to recover the file and to prevent the problem in future. Any help would be most appreciated (Obviously the data from the race is very important to me).