Quote Originally Posted by guyinnrw View Post
lasat update: it did NOT work; i finally gave up, i.e. rolled back to built-in CE map (with working JCV) ...
not sure what is fundamentally wrong ...
thxs for all the guys having helped me, though
The firmware of your zūmo 340LM CE may support the second kind of JCV layer structure only, like Nuvi 4x/5x do. If so, you must use the other JCV file in post #1, i.e. D3589130A.JCV. Give it a try. If still not working, please upload your CE JCV file to somewhere for research.