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Purchased Used Garmin, how to delete data that sync'd to Garmin Connect

So I purchased a used 810 and the person reset to factory setting, but did not delete all the old activities in the activity folder. In turn, it sync'd 158 activities to my Garmin Connect Account. Short of deleating 1 by 1, is there a way to undo that last sync or delete all activities from a specific device or ????

Thanks.