Quote Originally Posted by syzygy View Post
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.
You are right!!!
PreProgrammedLaneAssistTemplatePortrait is in garmindevice.xml - so D3589130A.JCV will work with sharm.

guyinnrw for my inattention!