For the newer Navcores and to get support for SDHC cards you should install the 5.5112 bootloader but that won't affect your problem.
The map as all features, so I have to ask: did you add the map or replace the old one? If you added the map you might want to go into the menu and switch to the new map.
Computer voices should work fine either in XL live emu or in X50 emu - you might have to edit the reskin file manually for that.
Same for the skin chooser: on some models it is simply phased out dur to cimpatibility issues, but editing the reskin manually will work.