no offline maps !!!

Hi.

I`m new here, bought Locus Pro just yesterday. Looks great! ... but: I can`t get the offline-maps working ... :(

I downloaded several maps from "mapsforge". I can easy use these maps with c-geo, but not with locus ... ? I saved the maps - as indicated - "mnt/sdcard/external_sd/Locus/maps/" - no auto load map. Then I tried to "+" the maps manually. "Process failed!". I can select the folder, but - for locus - it seams empty ... ???

So I downloaded an "gmapsupp.img" - but unfortunately I had no luck at all ...

What do I do wrong ???

Thank you very much and regards

maeggae