Jet Set radio-Chankast

[longi]

Hi, I recently dug out y old dream cast to play JSR, and found my dreamcast stopped working. As, a result I downloaded Chankast, but couldn't work out how to get the disc toplay so downloaded a rom. However, the rom says it is non-bootable in the description and every time I try to mount it onto my drve and run the game, Chankast asks me to insert a disc. The rom is in Cdi format and I have the bios and flash fiules. Is there anything I can do to ge my disc or the rom to work? to I have to use a Utopia boot cd? Please advise on how to get working.(p.s. I own the Eu version of JSR.) I got the rom from emuparadise by the way.