Hello Killzone_JDS,
You may need to restore your licenses to be able to access that shader again. This article can help explain how:
https://www.bungie.net/en/Help/Article/12181
English
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When I had my PS3 I preordered destiny and advanced warfare, got the gun smith shader. But when I switched to ps4 my Titan switched over and my my shader didn't? I tried to go to the advanced warfare add ons and re-download but I can't. Is there anyway I can get it back? And I just tried to restore licenses and didn't work?
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The Blacksmith shader is a console exclusive code. That means you can only access it on the console generation (in this case the PS3) that the code was entered on. The license for the shader does not follow your account to the PS4.