Help me to deal with the problem of app error 205 on 9550

I have done some stupid thing tonight, i tried to sync my contact in Blackberry Desktop Manager and tried to update and download all the new software they suggested me to download. However, a night mare occur, it said update error, and when i click my bb screen again, it just showed "app error 205". Does anyone know what can i do now? i try to use the "Loader" to see whether i can load the os back to the bb. Another bad thing occur, the loader can detect my bb, but i couldn't select to put into my bb. lol
pls help me:confused: