You appear to have made a number of updates (maps & firmware) and now have this problem. Try to localize the problem first and determine if it is not just a corrupt mapset file.
Make a copy of all the Nuvi gmapbmap.img, gmapsupp.img and gmaprom.img and related JCV files that may be on you unit.
Then delete them all from the Nuvi.
Try simulating the problem.
Them add gmap....img files one at a time with their related JCV files
Try simulating the problem each time.
If the problem occurs as you add these files you have determined it is a corrupt mapset and have know which one it is.
Good luck!!
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