[ioillusion]

1. Download the Blackberry Java Development Environment: In the blackberry developer downloads section on RIM's site.
2. With Desktop Manager shut down, connect your Blackberry, open a DOS prompt and type “javaloader -usb wipe” (omit –usb for serial) in the “\Program Files\Research In Motion\BlackBerry JDE 4.2.0” or corresponding directory.
3. Download and install a replacement Operating System (links may be on RIM’s site, good luck trying to find them) There are some on the blackberry forms, do a search for "blackberry OS", I'm blocked from posting the URL here.
4. Chances are you’ll have to do this about once a month until RIM corrects the problem in their OS, which probably won’t happen; RIM’s customers are like battered wives that keep coming back for more.