mohyom , all the 3 players you listed are likely to be Sunplus chipsets. Which at the moment are no tools available to fix them.
i'll suggest that you contact your seller for an exchange if they are still under warranty.
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Why are clones called MP4 Players, when they don`t play .MP4 at all?
It`s like an MP3 Player which plays Music CDs only.
T39 doesn''t sound as good as my T29
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