Homebrew VC injection banner colors?

[Deleted User]

There is a romhack of Mario Land that makes it a GBC game that came out to celebrate the Game Boy's 30th anniversary. I thought I would make it look like a special edition VC game by making the GBC model and the banner (the thing with the name and release date) gold. But the banner was still in black and white when I put it on my 3DS. Is there any way to get the banner in color?

 

[JammerPower]

Has Anyone found out the problem to this yet? currently having problems with my own. (In this case It's Super mario Advance 2 and the custom 256*64 foot banner I made seems to be in color in the program but appears grayscaled after downloading to the 3DS)