Your nuvicam can use one map in microSD's Garmin folder, named gmapsupp.img ONLY. If you want you can create a root folder named Map and then it can see multiple .img files with any convenient name [i.e. x:\Map\<any_name>.img], e.g. CNNT_MENA.img. Check that you have 'Hide extensions for known file types' unchecked in Windows Folder Options in case you've named your map 'gmapsupp.img.img' in error. Hard reset or clear nonvol if you haven't already done so after the fw update, in fact do it again regardless.