Rick...

Could be, and here's hoping the versions with the enery screen come up with some different number.

There's firmware and then there's firmware. Again I'm not as familiar with DENSO nav systems, but on the other ones I've worked with, the software it's loading when you insert a different version of the disk is sort of like the executable map software. The firmware I'm thinking of is more like the operating system. Think of the new disk as loading a patch into Word, while the "OS" firmware is like loading a patch into Windows. On the ones I have for VDO, it actually shuts down the NAV's OS, and goes into sort of a boot loader mode, and there is no way to get the nav to operate again until you load it's operating system.

Later!

Dan