their is only a way that i found is
step 1. first of all download the blackberry desktop software 7.0 on your pc and install wherever you want
step 2. then download the blackberry handheld software(remember please see your application version EX. 5.0.0.1036)
step 3. then open your desktop software and connect your phone with no battery or with battery(remember to make a backup of all your data before proceeding)
step 4. click on update and choose your handheld file you downloaded
step 5. then click next and do as according it is said
step 6. wait for some time it would take a longer time for the updation
step 7. when the updation is finished dont unplug your phone from pc
step 8. as your phone reboots wait for the final updation
congo you have successfully updated your device and your problem has been solved
further if this problem occurs hen you can again do these step and solve
IF STILL YOUR PROBLEM PERSIST THEN YOU MUST CONTACT YOUR NEAREST BLACKBERRY CUSTOMER SERVICE CENTER
THANK YOU AND REPLY IF YOUR PROBLEM IS SOLVED OR NOT