Hello!
There's a confusing mistake (or typo) in the CFW 2.0.4 description in the first post: -
Important!: CAN ONLY BE INSTALLED OVER OFFICIAL/CUSTOM FIRMWARE 2.0.3. See official 2.0.4 thread for upgrade path info. -> It suggests that -what it exactly says- that it can ONLY be installed over 2.0.3, and that would exclude Official 2.0.4 as well, which isn't the case, is it?! :
More controversial the following link leads to the Offical 2.0.4 Thread.