what software did you use? try to get a friends battery and see if it opens with that. if it doesn't open, but the red light ( you have a light on top of the phone don't you?) is flashing, then is possible that the EROM is dead.

try this, and thnx to justme:

If the red light on top is flashing try this:

Download latest Wotan Client
Remove the battery
Delete the login data in Wotan
Press start button
Hold down the keys 2+5 and connect to DCU-60
Insert the battery again (while you still hold down 2+5)
Release the buttons when your phone get's recognized

i repaired my phone by doing this once