hello Hari Saladi ,
it is very easy to fix your phone. case is the firmware not update properly
Use [http://www.blackberryfreaks.com/JL_Cmder.html|this] line to download JL commander
* install jl commander
* connect your blackberry to pc via USB cable
* select option 5 (reset to factory defaults)
* your phone will be restart and hangs with error on white screen
* install blackberry desktop manager using [http://us.blackberry.com/software/desktop.html|this] link
* update software gain
after updating the software you can use your blackberry with better performance ever !