Well, so far I wrote a tool that lets me include code into the existing firmware or create a new firmware file from some binary code. I also did a little research on the firmware of my player and could identify some functions. Actually I wasnt able to do sth useful except for verifying that my code actually gets executed and fried the player twice. Happily I was able to repair it using the RK27 Device Manager. Well, thats it.
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