I believe this was mentioned in the 4.5 thread either the sticky one here or in the 4.5 forum. My guess is the BB is nuked and will need to follow the directions in the recovering a nuked berry thread. Someone else may need to chime in here to confirm.
Posted from my CrackBerry at wapforums.crackberry.com
Oh god... This same thing happened to me. App error 504 I believe? It took me hours to get my berry back. But follow the directions and you should be good. One tip: always read the comments on the blog posts before downloading anything I learned that the hard way...
Posted from my CrackBerry at wapforums.crackberry.com