I have been playing with my unit and when it almost died.
I had been marking way points on Navionics PC APP and uploading them to my 798 CI HD when I got a message that there was too much data to save on the unit. I lost power because my power cord was loose again. When I got back in to the unit, it would freeze when ever I tried to access the WT Management system or any DI. I could not use the unit to trouble shoot the problem or free up memory.I tried to reload the current software and it would not load because it was the current version.
Researching the forum, I installed a prefious version of the firmware and then reloaded the current verion. Other that eliminating my WT groups, everything was working fine after the reload of the firmware.
I reorganized the Way Points thaat were still there and I am back to where I was before the unit started locking up.
This whole episode scared me because there are some nice days out there and I did not want to lose the use of my new 798. Thanks for having the previous versions of the firmware. Using them, I was able to recover without having to call Humminbird customer support.