Quote Originally Posted by Xtracrispy69 View Post
Been reading a lot on these posts and people are doing a lot of different things. Maybe someone can point me in the best direction. Have a nuvi 250. Have the latest software but 2008 maps. I saw three styles of downloads on page 1 of this post: standalone unlock with multiple files, the full 4 gig (which I'm guessing has mapsource in it?), and the unlocked img on its own. Why are people doing different things? I downloaded the img, put it on an sd card, ran the nuvi, selected the map and nothing changed. I did notice on the main memory the main file is a prom.img and the card runs supp.img. If I want to update this properly what method should I do? Any help would be great.
Rename your original file gmapprom.img to gmapprom.img.old so your device will not "see" it anymore an it will read map from SD card.
Later if you want to restore original file you could just remove .old extension