New weapons of the dynasty.

Hey guys, can you help me figure out what's wrong? I wanted to get a Dynasty weapon using the Inferno mission. You know, the method everyone uses. I downloaded it, replaced the files, and followed the instructions. I've been trying for over half an hour, but the Dynasty weapon hasn't dropped. Instead, I've found all the amulets. There are amulets in the chests, but I haven't seen any other items, let alone the Dynasty weapon. Can you tell me what the problem is? Why isn't it dropping?