Have the MP3 player sent back because the folder navigation is not working. I suspect that it is due to a firmware bug and the slow memory card. Strangely enough, the the same menu as my old Teac MP3 Player with built-in memory and there the folder navigation works flawlessly. Would that work, it would be a good player. Incorrect operation can I exclude 100% tens, as I said, the menu is identical to my old Teac and I proceeded as in the manual.