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hats
@Greenbank
sometimes you can rescue an activity by shoving the broken .fit file through one of the tools at https://www.fitfiletools.com/#/top
I sometimes use the 'Corrupt Time Fixer' to resurrect something that GC tells me is corrupt. It sometimes strips off other data but I assume that's just some of the data that was broken.
FWIW I never delete activities from my 935 and rely on it to do its own management and cull the oldest ones if it starts to run out of space. In the two years I've been using it (665 activities) I've only got 4 that have _FIXED in the name in my archives. Likewise I'm lucky that none have been activities I really wouldn't want to have lost.