Here are 3 firmwares which are from the same type of player as yours, no guarantees they will work any better though, you may have a hardware problem, a lot of these players arn't very well made i'm afraid. 
http://www.mympxplayer.org/rockchip-...e-2-df907.html
http://www.mympxplayer.org/rockchip-...one-df906.html
http://www.mympxplayer.org/rockchip-...706-df897.html
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