Triathlon activity crashed Garmin watch after bike-to-run transition, and will not sync to Connect app

Watch: Epix Pro Gen 2 on latest firmware.

I have the .fit file and have tried and failed to repair it using fitfiletools.com and FitEdit and Fit File Repair Tool. I only need the swim part of the activity as I dual-recorded the bike section on my Edge for navigation, and as the watch crashed at the start of the run, I simply began a new run activity a few hundred metres in.

Any help would be appreciated greatly.

Thanks!