shinjisan
Have you tried the Rockchip DEAD player recovery guide here?
http://www.mympxplayer.org/rockchip-...582.html#50582
hhh666 has recovered his player (same type as yours) just by shorting the pins to get a re-boot.
Best to try this first, don't try to install another firmware, you will probably BRICK you player!!
Good luck..