I tried installing updated software on my Humminbird 798, but it doesn't seem to be the case. I've downloaded the newest version onto an SD card. It's says all waypoints have been transferred (or something like that), and then that there is no new NAV data. When I go into the system information it still says that I'm using version 5.840, not 6.300.

I've tried deleting and updating again the SD, but to no avail. Ideas?