The complete cityXplorerEU maps (FID 800) are working, with EPM (and public transport also!).
Tested in Nüvi 1390T and Nüvi 1255. Cities tested: München, Nürnberg (Germany) and Athens (Greece, with public transport only the 3 metro lines).
These CityXplorer maps are the first working in my Nüvi 1390T with EPM & public transport (U-Bahn), except of course a map that I have purchased which came with an unlock file(.unl) and a cryptic file with .gma extention.
No 3D maps (The units tested don't accept 3D files).

For anyone interested in details:
The .unl file was computed with the unit ID (not the SD card ID), FID 800, PID 1, 0, 0.
The files were put in folder Map in SD card. The main map (gmapsupp.img) was in the same folder.

vanish90 Thanks