Same problem reported by others. Reformatted SD card and reloaded multiple times, following instructions on website carefully, but unit can't recognize files on SD card. Finally called Customer Support, which offered to send a preloaded SD card free. It sent to the wrong address, so I'm still waiting. Meanwhile, system only reads a random handful of music loaded on a different SD card. The design problems of this unit are almost certainly beyond a firmware upgrade anyway. I made an expensive mistake buying a Z130BT. Don't you love the high-pitched scream from a wave file somewhere in that firm