What roms have you been trying? Had a crack just now and all except A4SHB00H seem to load but have very few tables that can be altered. Not fully completed definition files maybe..
Go here and download A4SHC00G, just click the number, then try running in ECUFlash. if that doesn't open correctly then there is something not quite right with what programs have been installed.
http://www.romraider.com/forum/viewtopic.php?f=35&t=7591
Also try download learning view and run that with just the test mode connectors connected, may not need the other ones connected when only reading. That will give you the ecu id and rom id for your ecu.