Mark has the files and links to how-to’s to do this yourself.
I just updated both my MCSa and my sisterâ€™s MCC Navi with v26 of the firmware. The upgrade has changed the Navi so much. The color of the maps and detail is what it should have been. My hats off to those who created this update.
I am hosting the upgrade on my site to help people who might want to upgrade their Navi. Please understand this is for the MKIV Navi system only. Meaning only for the DVD based system.