I am having this strange issue ONLY with 2 of the 06 production date MK4 I have (I think it's the units, since one of them I used the BMW original 27.1 and the other I downloaded a 27.1) , all the other
older MK4 unit didn't have the issue.

I just installed and upgraded to a Mk4(From Mk3, later 01 production x5), also upgraded to a BMW original 27.1 disc, everything went well. The only strange thing is when I finished upgrade the O.S. I got a message like Nav locked or something, but again everything works fine, even got the 3D graphics.

The problem I have it when I try to eject the DVD map, I get this screen on the monitor asking for a 4 digit code. I don't think it's the radio code, since the radio works fine as well, and I can also make this screen go away by press enter without entering any digit.

However, everytime I try to eject the disc, I get this screen and the disc won't come out, like it's locked in the Nav drive.

I took it to my good dealer today, they didn't have any idea either, but are looking into it for me.

I wonder if there is a security option that will prevent someone from taking a disk?

Thanks for any help you may be able to offer.