Nope. There is no backdoor, master, nor override password to unlock a BB that is device locked. Only the user-created password can unlock it. There is no other way. This is part of the high security for which BBs are recognized.
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.