Nah, I followed those same directions for the firmware updates and used a different SD card. The nav system uses the 4gb card that came with the unit to store the maps. Map updates are done using Clarion's "NaviExtras" update tool. It tells you to remove the SD card from the radio and plug it into your PC. The card is serialized/coded which allows Clarion's servers to recognize the specific radio you have. Beats having to drag a laptop out to the camper and plug it in, I guess, but the space limitation on the card is a problem.
Bottom line is that the radio/gps is working fine with latest firmware and updated maps that only cover half of the US.
Ty & Deb Montag
2015 Jayco Seneca 36FK
2014 Honda CR-V toad