I split this off and started a new topic for this subject since it was related to a different unit.We do not have 6.490 for the 898 listed in the download section. Did your unit ship with this version or are you looking to upgrade to it?
It may have shipped on some units, but was not officially released to the public as an update. If this is the case, you will need to contact
Humminbird_Greg here on the forum.
Maybe some other 898 users can let us know if thats the case.
Good Luck,
Robert