Galaxieman & DAM2991 , currently the firmware extractor only supports upto v9.0.43, so both v9.0.48 and v9.0.50 are not yet supported.
Regards to firmware downgrade or upgrade, it is definitely a negative. Every firmware was specifically made for each batch of players. So another firmware with the same version number, likely it would not work on your player.
15minutes video playback time on a full charge is very little. Likely there is a problem with your battery and it does not hold it's charge well. On a stock battery, you should be getting a minimum of 2-3hours music playback or 1-2 video playback.
What i can suggest is to contact your seller for a replacement player. Alternatively, you can buy a replacement battery either from ebay or uxcell (someone posted about uxcell selling replacement batteries). But either way, open your player and measure the space allowed for the battery so you do not buy one that is too big for your player.
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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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