http://www8.garmin.com/support/download_details.jsp?id=10270
Changes made from version 3.62 to 3.64:
Fixed a potential issue where we would attempt to display an invalid date/time for certain iOS calendar notifications.
Fixed a potential issue where invalid data would be entered in the activity FIT file during a pool swim, if one were to press the lap button in quick succession.
Fixed a potential issue where some data was getting clipped on a particular watch face. (Requires Display FW v3.60)
Fixed a potential issue where the users calories could drop to 0 during an activity.
Fixed a potential issue where users VO2 max and performance condition values were getting affected with non-Run and Bike activities. (Ex: Walk, Hike, SUP).