Ah. I see what AMD has done. They named the Kaveri architecture 840 and then while simply changing the number to 845, they introduced new architecture; Carrizo. I forgot that the Carizzo was out now. That is no doubt why it won't post. Different architecture. That is a dirty trick. A new platform should have a new numbering scheme.
If you have the V1 board, I'm afraid you are out of luck.
You could try contacting MSI and see if they have a BIOS you can flash to that will recognize the new architecture. They may just not have it on the old board's site.