I found a firmware which has the same interface as yours and screen size, its is v0.0.000 only the boot up screen is different.
It is in a download of 31 firmwares uploaded by harshit in this thread:-
31 Rockchip Firmwares
It is worth trying to load this firmware as the menu is the same as yours.
The firmware to try is called "1211.rfw", if you cant use your player then you have nothing to lose.