Thank you, Bertil.
I had it running briefly after the display showed 1000. Then I took it out because my neighbor wants to use the device for his Golf. Now I don't remember which button I had to press. But if it worked with the 1000 displayed, shouldn't that actually be the code? Or am I mistaken

?
If necessary, the VAG dealer who sold me the car along with the radio without an instruction manual and without a code card will have to take it back.

They will then have to find a solution.
Thank you and best regards.
Heart.