Just basically have to hook it up to the PC and reload the firmware. (Tnough it seems the company is no longer in business, you might be able to find the firmware update file out on the net somewhere.) Seems to freeze up more if I have the SD memory card in there. Had better luck with some types of SD cards than others (faster speed cards seem to cause me less probs.) or backup the music etc, and restore the player to factory settings. good luck.
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