I found this on a dedicated BlackBerry forum:
http://www.blackberryforums.com/general-legacy-device-discussion/9430-7290-tcu-exception.html
I just wish to add that if you don't know how start the Application Loader (at step 3)on the new versions of the BlackBerry Desktop Software, navigate to:
C:\Program Files\Common Files\Research In Motion\AppLoader
double-click the file named "Loader.exe"
my blackberry 7290 won't work anymore.everytime i open it the screen would only say TCU exception reset. . how will i fix this

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