TSB: NAVIGATION UNIT SOFTWARE UPGRADE - This bulletin provides the procedure for upgrading the navigation system software on some 2014MY Cadenza (VG) vehicles, produced from March 11, 2013 through January 24, 2014. The software upgrade addresses the following concerns: 1. Error Messages displayed in Korean (Navi.exe and mmMedia.exe) which are sometimes followed by system lock-ups. 2. Speed Dependent Volume staying active. 3. Sirius Traffic being inoperative or intermittently inoperative.