Custom Firmware For Low End Players

[SparkDev7]

First, I would like to say that this question is probably a little off topic, but, I couldn't find a good place to put it.
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So, I joined the Rockbox forums for 1 reason... to get advice on how to create some custom firmware for lower end players that will never support Rockbox (Namely The AGPTek A02 Player.). I know i should probably learn C (I am currently learning C++), but other than that I have no clue what to do! I just thought that The Rockbox Team would be able to give me some advice and tips on this subject.
Thanks.

[saratoga]

I would start by learning c and then learning assembly.  Some additional study of operating systems, embedded systems, and electronics would also be extremely useful. 

At that point, disassemble their firmware, learn how it works, and then write your own operating system for it. 

[SparkDev7]

Thanks. How Would I Disassemble their firmware?

[saratoga]

I don't think you need to worry about that right now.