gmapbmap.img is the base map, leave it like it is
gmapprom.img is the preloaded detailed map ,your CNEU old map: the one you must substitute-gmapprom.img is the right name
gmaptz.img is the timezone map, leave it like it is, I think is always the same
gmap3d.img is the 3D buildings map, subsitute it with the new one
all the files you need are in post one

take a look to
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these tutorials are made for new users convenience
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