This problem is often found in some people using blackberries Jave.
The solution is quite complicated, because backup data is difficult, even I could not.
Because hangs directly connect with DM.
The solution is the wrong one: Blackberry reinstall the firmware. but data can not be backup. (Wipe then reinstall)
-. Disconnect the battery Blackberry
-. Plug into your PC / laptop to writing device connected to Unknown
-. Next and run the next step.