Hmmm, these are good reasons to try upgrading, but still...
All players from any type currently support at least playlists. And for the sound problem, ¿can you contact the seller and inquire for that? maybe you got a defective unit... If you really want to search for firmware (on your own risk), you need to open the player and find the board ID, a white text written somewhere in it. But you first need to take into account warranty issues and stuff, if you open it you could lose your warranty.
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With a bunch of MP4 players for repair... and none will be mine  , now that''s bad luck.
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