What have you tried?
If it's just a botched install/upgrade, try wiping and then reinstalling the OS.
How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ
What to do next if Jl Cmder will not connect and wipe - BlackBerryFAQ
I advise downloading and installing the device software the old fashioned way instead of letting desktop manager do it automatically over the internet.