I know some people already know, but n00bs keep pestering me asking for an iR Shell for the ultimate firmware, so here it is. http://www.dcemu.co.uk/vbulletin/showthread.php?t=39814
I have tested it to run on SE-C and SE-B''. Not sure about others but 99% chance it'll work on them too, it was designed for SE-A, and 99% chance SE-B'' is the lowest version people are still using. The only reason not to have C is either laziness, since C doesn't have many new features, or because XFlash as of now doesn't support C.