ford audio 6000cd reset problem?

I had to disconnect my battery on Ford Focus which means I now need to reset my Audio 6000CD. I have the code - was on card with manual, but when I type in the code and press the reset button (No. 5) absolutely nothing happens. Have tried this more than 10 times and by all accounts it should be locking me out by now. Also notice the serial number on the Card begins with a V and not an M like many others