i have he bb pearl and i was updating it 2 days a go and it failed at 56% it then shuts down restarts and then shuts no i have a the led light blinking over and over again no screen iv tried java loader and some other things if have any thing else to tell me that can help please tell me and i was updating to 4.5 os the computer does not detect the phone....

Wiping with JL Commander is step one: How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ
Then re-install the update. Start with a fresh download of the OS from the link at the top of the 8100-series forum.