Bro i all ready try this .
When i connect the set with PC it show me to Unknown USB than i start Update.
My BB problem is when start Updating than

Load JVM & system software
& after that when set goes to reconnect for "wait For Device initialization" than it show the error Unable to reconect to the Device During a Multi stage load operation.

I try with battery & without battery but both ways same erro.

Can any one help me pls..