Need Code for Blaupunkt Car Stereo in Nissan Primera P11?

Hi

I need a code to restart my BLAUPUNKT car stereo which locked up after an engine change.

Stereo Model numbers are as follows:
BP934713909255
Nissan Mid Line Radio RH
7 649 347 318

I would also need instructions of how to enter the code into the radio.

The car itself is a nissan primera p11. Can anybody help?