I am using Kenwood DNX 9960 (AVN 4.1/5 unit). The Kenwood is from the US. but the Garmin has Thai keyboard in it and be able to search Thai POI. I am not sure exactly what is the region of Garmin Firmware. I would like to use the JCV, 3D and the Thai TTS. What should I do to make it works. So far, I rename the non-TTS Thai voice as the American English_vpm and it speaks. I will try the same method for the Thai TTS today. For the JCV and 3D file, where should I put it? In the unit or in the SD card?