How to RESET a Blaupunkt Radio?

I have a '92 Jaguar XJS with the Blaupunkt receiver/tape player. After repeated attempts guessing the code, the system locked me out. I have the correct code I've used previously to unlock it(to lazy to find it the first time). Now the radio won't turn on or prompt me for a code AT ALL. I have had the unit completely disconnected from the car for days, yet nothing. I've tried several different methods to reset it to no evail.
How do you unlock this radio so that it will prompt me to enter the CORRECT code this time?
Again, it does not display anything. Only the little security LED blinks all the time.

Thank You