Hello, currently driving a Smart Facelift (Bj. ’10). The standard radio (not a CD drive, but aux and USB in the glove compartment) is completely advanced. How does a USB stick have to be shaped so that the system can read it? Have tested both NTFS and FAT32. Both times with mp3 files. Each time comes the message that the files are not readable. What do? Thank you for your answers!