Upgrading the BIOS won't help. A locked drive is a locked drive, without the code to unlock on boot, the drive won't work.
The only way you will be able to unlock it is if you used ConfigMagic to lock the drive. As far as I know, ConfigMagic locks the drive with a generic password (Something like T E A M A S S E M B L Y, not totally sure) which you would be able to feed into a computer utility to unlock the drive (Do as search on this, no one really uses this method any more because of Config Magic).
If you manually locked it, the only way to unlock again is if you know the code. If you do know the code, you should know how to lock and unlock manually as you will have already done it once. If you don't know the code, and didn't lock the drive with ConfigMagic, then it's time to throw the drive in the bin, put you hand in your pocket and start a fresh.