Quoted from nerbflong:You have a chroma board, so you need the chroma.rom file.
http://www.colordmd.com/download1.php?rom=IJ4_4_1
Make sure the file is not chroma(1).rom. It must be chroma.rom on your USB drive.
On top of this, turn on your game first. Then plug in your USB drive, and then hold the USB button down until the screen goes blank. It will take close to a minute to load the color ROM.