You've posted in the wrong section - your question has nothing to do with Xbox BIOSes....
You need to provide more detail. How did you softmod your Xbox - gamesave, or hotswap? Which softmod package did you use (not the name of the game you used, the name and version of the package)? Has it ever worked, or is this a new problem? If it used to work, what did you do just before it stopped working?