A VERY good thing to have btw for your player. Don't ask me WHY, but my player has been operating even better since I downloaded this. No problems, no glitches, no headaches(geez I sound like a commercial)...lol!!

Yes you can perform a rollback. To do that, you need to download a previous version of the Firmware, then place the device into recovery mode (hold switch and hold the record button down, then connect to the computer. Once the player says "Welcome to Recovery Mode" on the screen, you can let go of the record button), then just drag and drop the firmware files onto the player (It'll show up as 16MB Format in your My Computer window). Disconnect and your good to go. Though bad track is normally indicative of a problem with the files themselves. Have you tried formatting and reloading the tracks?