Hallo,
Ich bin ungarisch, und unglücklich kann nicht schreiben Deutch, nur English.
I found new codes for DVD navi system:
6414 old, well known
1310
1981
842520 <- this is the most interesting. you will get lot possibilties.
visit: http:\\solesz.extra.hu for details.
I put some screen on this site.
To enter these codes: MENU for 10 sec, the enter. (to be able to handle NAV related screens within the secret menus, you need before "agree" under the NAV button, then wait for displaying the map, then push MENU for 10 sec)
mfg
solesz