Motorola Milestone - no service after installing custom mod

[ImmaCracker]

I just installed cyanogen on my motorola milestone, which is basically the same as the Droid, and now I do not have service at all... The install went great and everything else works, i just can't make any calls or text so now I have a really expensive paperweight.. I read on a few posts from people that had the same problems that I should flash my radio but I cannot find out how to do it for my phone. Any help would be appreciated and if I am wrong as to why I do not have service please let me know.