Think I have killed my Mag 254?!? :(

Hi all, hope someone can help. I stupidly played about with the settings before reading up on the receiver. It keeps telling me Wrong image so I went into BIOS setting an changed it to NAND but is still wouldn't boot up, same problem wrong image, TPFT load but would not load. So I then tried a factory reset which has no left me with a blue screen and I'm still getting wrong image message. Is there a way I can re install the image etc??
Cheers
Mark