Homebrew Customising ds firmware

[MadMod]

Before you say "why?" Lemme explain myself. I made an awesome new shell for my ds lite and i thought it'd be cool if i could change the ds's main menu to match the theme.

All i want to do is: 1. change the sound that plays on bootup, 2. Change the background color of the main menu, and 3. Change the color of the grid lines. Every other feature would remain unchanged.

So far i've managed to dump the firmware and decrypt it using fwunpack. Now i have a bunch of .bin files. Not sure what to do from here. Do i need some kind of decompiler to turn it all back into c++ code? This reverse engineering stuffs new to me.

Could anyone point me in the right direction? Any help would be appreciated.

 

[Deleted User]

A *.BIN file could be anything. Did you look at the headers of a handful of them?

 

[MadMod]

A *.BIN file could be anything. Did you look at the headers of a handful of them?

Yeah, should've mentioned that in the original post.
There's a header.bin, guidata.bin, arm9gui.bin, arm9boot.bin, arm7gui.bin, and arm7boot.bin.

 

[CeeDee]

Yeah, should've mentioned that in the original post.
There's a header.bin, guidata.bin, arm9gui.bin, arm9boot.bin, arm7gui.bin, and arm7boot.bin.

The gui files might have the graphics in them.

 

[MadMod]

The gui files might have the graphics in them.

Thats what i figured too, the question is, how to convert a .bin file back into code... its all unicode and hex as is. The only thing i can make out is the text

 

[DSoryu]

Thats what i figured too, the question is, how to convert a .bin file back into code... its all unicode and hex as is. The only thing i can make out is the text

You need to reverse those binaries, it could be anything. The best start is to analize them through a HEX viewer.