read here please
[Only registered and activated users can see links. ]
If you have LT ,you need just to register on MyGarmin page and download the new map with Mapupdater it will give all the files you need, gma files and .unl files too : it's the easiest way .
No problem with unlocked IMGs , you can copy them in an sd and remove it if you have problems.
For your other question look here

[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]

thread colosed, please post in maps thread if you need help, here is not the right section, but try to read at already answered questions in tutorials section
thanks