GPSMAP 64 (WebUpdater) software version 2.50
as of March 24, 2014
(10.21 MB)

Changes made from version 2.40 to 2.50:

Improved average ascent and average descent data fields
Improved vertical speed and grade data fields
Improved transfer speed between device and BaseCamp Mobile or Garmin Connect Mobile (64s/64st models)
Fixed potential issue when programming a chirp (64s/64st models)
Fixed potential shutdown when using smart notifications
Fixed displaying duplicate smart notifications in certain instances

Spoiler:
http://www8.garmin.com/support/download_details.jsp?id=6805


Spoiler:
http://download.garmin.com/software/GPSMAP64_WebUpdater__250.gcd


p.s.
CN still don't work
I think we need updated gimgunlock tool for this unit.