Montana 610/680 Web Updater Version 2.40 patched with the JNX loader patcher 3.40 seems to be OK.
Updates & Downloads
Montana 610/680 software version 2.40
as of February 16, 2016
Use Garmin Express to install this file.
Change History
Changes made from version 2.30 to 2.40:
Fixed issue with incorrect trip computer time.
Fixed issue with track points being recorded while tracking was paused.
Fixed heart rate related data fields
Fixed issue with wrong road signs being shown in certain countries.