Springbok

I need help with my 8000nex. I bought it from Car Toys and they installed it. When done the guy showed me how to use it and I set an anti theft password on it. Fast forward 6-8 months later my car battery dies and after I bought a new battery and turned the car on the 8000nex wants the password. I don't know what it is! Can someone help, I have no radio, nothing!