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dnchcw
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I find it in Garmin FIT developer forum
DataNumen FIT Repair
Repair and recover corrupt Garmin FIT files
DataNumen FIT Repair is a powerful tool to repair and recover corrupt Garmin FIT files. It can scan the FIT files, then repair your data in them as much as possible, so to minimize the loss in file corruption.
DataNumen FIT Repair
Repair and recover corrupt Garmin FIT files