Cannot enter radio code (Omega B)

Huhu, now the radio is in, but he doesn’t let me enter the code. Again, for those who don’t know it yet My father bought a Volvo on Friday, on Saturday our Omega was in the newspaper and was bought immediately, but the car is not yet paid and is still standing with us until 29.12 at the earliest. Problem, because I had to drive the car for 8 months, I beat my Kenwood in there so that I can at least listen to CDs. I myself have left in the Astra The Astra has also been registered for 1 1/2 years and I drive the Omega very rarely, but I left the radio in it anyway. Now Issa but sold and my Kenwood should actually be sold net. So the old one has to get back in, which I just finally got there. The radio also lights up and if the car is off or the key is out, the red light also lights up because of the code. According to the instructions for use I have to have keys in it. , Ignition on, radio on and then there should be computer “Code” or “Safe” right on the board, then I should hold the AS key pressed until a signal comes so that I can enter the code. Now I’ve been stuck there for half an hour, I press the AS key for infinitely long, but it doesn’t appear n signal tone, nor can I enter the code. What can I do now? Or what does that mean? What’s the matter with this thing?