I know with the U.S. Versions with Navi it's definitely possible to change the languages. The unit does reboot when you change languages (did it by accident). I don't have the manual right in front of me to give you instructions though.My best guess is that the system will have to be reprogrammed. Assuming they still require it (I know they do on European cars, such as BMW's), the Tucson will have to be 'converted' to US standards before it can be licensed in the states anyway.