Yeah, unfortunatly, you're in a bind here. Your version is newer than the latest version we have posted. I'm not sure if your version is available from another carrier. The only way to use one of the older versions is to downgrade your OS to one of the earlier versions. I doubt you'll want to do that.
Check throught the CDMA carriers in this list and see if you can find a version that matches yours. BlackBerry Operating System Downloads - BlackBerryFAQ