Garmin new protection requires a digital certificate in a GMA file. Only the legitimate buyer of a Garmin map product license will receive the GMA file connected to his/her GPS unit. That's implemented for maps with mapid >= 2200.
One solution is to use the unlocker instead of the unl file and KG. It removes the check for GMA files.
if you have a preloaded map named gmapprom.img the secondary map must be gmapprom1.img or a map with .img extension in a Map folder (internal memory or sd)
Your preloaded gmapprom.img wont be unlocked without gmapprom.gma
to unlock maps you can use
[Only registered and activated users can see links. ]
or
[Only registered and activated users can see links. ]