I upgraded the firmware to 2.15 as instructed. I could transfer MP3 files from either RioPort Audio Manager 3.3 or Real Jukebox Plus to Rio 500, but it would not play the songs on it. It shows 12:15 for the song length and 0Kbps for the format. I am sure these songs are 128K and around 3-4minutes. I re-did these MP3 from my CDs again, but no help. I am using Windows 2000 on Pentium III. Anyone could help me? Thanks.