Neil,

Thank you so much. Your solution worked like a charm. Backup went smoothly. Your suggestion about the clean SD card is spot on. It turns out all my trouble in flashing 6.2 was because I had a Map folder and/or other nuvi related folders/content on the same SD as the gupdate. As an experiment, I renamed all the folders by appending extra characters and making them inert to the nuvi. Then, before I reset anything, I tried the flashing with gupdate all alone in the Garmin folder. It worked beautifully. So my problem is solved. Thank you again for your help.