Garmin released Firmware 3.60 for Oregon 6x0 today, 18 December, 2013.
Changes made from version 3.50 to 3.60:
New GPS Version: 50201
Fixed calories not being displayed when using a heart rate monitor.
Fixed erroneous temperature values below 0 degrees C when using a tempe wireless temperature sensor.
Fixed proximity warning alert text being unreadable in some situations.
Fixed possible shutdown when using the Favorites dashboard.