Things You'll Need
Instructions
Turn on your JTAG Xbox 360 and connect your external hard drive.
Copy the file containing the secondary camouflage you wish to change and paste it to the USB drive.
Disconnect your USB drive from your Xbox 360 and connect it to your computer.
Open the file containing the secondary camouflage graphic in MS Paint or another graphics editor.
Make the changes to the camouflage, then save the file.
Disconnect the USB drive from your computer and connect it to your Xbox 360.
Overwrite the camouflage file with the new one you edited. This will change the appearance of the gun while you play.