cuteday , Rockchip players are not recommended to be upgraded. The firmware files you have downloaded are all for Actions chipsets, not Rockchip.
Rockchip players once bricked with a wrong firmware update, usually would need to be factory reseted as the firmware tools for it are very rare on the internet. Besides, there isin't many Rockchip firmwares around.
So what i'll suggest is to just enjoy your player as it is. Never do any firmware updates to it. You have almost close to 0% chance of recovery should you brick it.
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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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