Ouch. I am hoping (Fingers crossed) that you have a backup. You will need to try and re-load the OS.
Start here: How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ
If that fails: What to do next if Jl Cmder will not connect and wipe - BlackBerryFAQ
Then: How do I upgrade the OS on my BlackBerry? - BlackBerryFAQ
Be patient in the last step and DO NOT disconnect until it is complete.