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Doesn't mean it doesn't work. Its that its not for your version.
If you installed it, you may have to edit param.sfo and eboot to your version. But I have no idea what you downloaded as you don't link to it.
I downloaded the link for the BLAS version earlier in this thread. I have the official update as well. For whatever reason, the item just won't show up.
Incidentally, I'm using Rogero 4.55 1.00 CFW, and the 4.21+ fix...