You should wipe the device using javaloader and re-install your os using desktop manager. Here is some javaloader info from "BlackBerry Guides"
You should use the "javaloader -usb wipe" command
Sorry but the formatting is a bit screwed up - the file has been copied a few times.
To use the JavaLoader.exe file to perform low-level, debugging, or loading operations on a BlackBerry
JavaLoader.exe is a powerful tool that can be used for various administrative tasks on the BlackBerry, however most users (and admins too) find it difficult to use.
Relevant for all USB java models (in theory serial/com port models are the same, but you must specify the port the device is attached to rather than USB)
All Java versions
0. This guide only covers those JavaLoader utilities which we have experience with, if you have experience with the other utilities we'd be glad to add the use here (contact us please).
0. We use output redirection to save some of JavaLoader's output to a text file, to display on the screen rather than save to a file remove the "> file.txt" portion of the command.
0. These commands must be run from a Command shell (Win9x: Start --> Run --> command, Win2000+: Start --> Run --> cmd) and in the directory (folder) where javaloader.exe exists (typically: C:Program FilesResearch In MotionBlackBerry JDE 4.0bin).
WARNING: The Javaloader.exe tool should be handled with extreme care, particularily when used for wiping devices, loading modules, or removing modules. BlackBerryGuide.com (and its affiliates) take no responsibility in the use of this tool, use at your own risk. Please read our disclaimer for more information.
JavaLoader.exe comes with the BlackBerry JDE, you can download it here: http://www.blackberry.com/developers...ls/index.shtml
Usage: JavaLoader [-usb] [-p] [-b] [-d0|-d1] [-w] [-i] [-q]
is one of dir [-d] [-s] deviceinfo load ... ?save ... info [-d] ... wipe [-f | -a] erase [-f] ... debugmode eventlog settime radio on|off enum siblinginfo ...
Load a .cod file to the device:javaloader -usb load
Note on dependencies: If you are loading many modules, load the child-modules first
Erase a module from the device (caution is urged):javaloader -usb erase
Erase a module from the device (force if in use, extreme caution is urged):javaloader -usb erase -f
Wipe the device (considered a low-level format, caution is urged):javaloader -usb wipe
Save the device info to a text file (device.txt):javaloader -usb deviceinfo > device.txt
Save the eventlog to a text file (event.txt):javaloader -usb eventlog > event.txt
Save a listing of all modules on the device to a text file (dir.txt):javaloader -usb dir > dir.txt
Save a listing of all modules & Dependencies on the device to a ?text file (dir.txt):javaloader -usb dir -d > dir.txt
Save a listing of all modules & sub-modules on the device to a text file (dir.txt):javaloader -usb dir -s > dir.txt
Turn the device radio on:javaloader -usb radio on
Turn the device radio off:javaloader -usb radio off