So I Googled 'Garmin FR910xt soft Reset' and followed the steps in the first result that Google displayed. Turns out these were the steps for a master reset, for fuck fucking sake!
And yet it still didn't sync.
I lied, it was ProgramData/Garmin folder
Will give that a go, and failing that will try a re-install...
One of my old Garmin watches stopped syncing and never started again (regardless of trying multiple Ant+ sticks and multiple PCs). Possibly not the answer you wanted.
So I Googled 'Garmin FR910xt soft Reset' and followed the steps in the first result that Google displayed. Turns out these were the steps for a master reset, for fuck fucking sake!
And yet it still didn't sync.
Will give that a go, and failing that will try a re-install...