The unofficial CyanogenMod7 port also works on my player, it's quite good too.
Android market and the G sensor doesn't work plus it is a bit more laggy, but the UI looks really cool.
[DEV] unofficial CyanogenMod7 port for RK2818 tablets - xda-developers
You just need to swap out the boot.img and system.img and replace and repack into the Onda update.img using
AFPTool.