Yes, I stripped loads of stuff out, I wanted to make a minimal firmware. It can browse files, display .jpgs and play mp3s. It has a new character set and scrolling text. It would be easy to restore if needed, but it just has tetris game, no .rkp loading.
If you find you can use this firmware the original download is here:-
http://ftp.zsctc.com/RK2606A_SDK_1.08_Release.rar
password ttee