need help with smaw

I need some help

I have the smaw address and im trying to unlock the skull camo for it.

But when it try to change it nothing happens. I unlocked gold for it and that works but not for skulls.

Anyone have an idea what i can do to change it?

try to change the 6th byte to the right from the skull adress maybe its the same "glitch" as with the snipers :P