Need help with oem radio code

[dsphil]

I just bought an E30 couple weeks ago that came with oem radio. the PO install an aftermarket headunit and I don't like it. It doesn't work anyway.

EIN WBAAB5406G9681239
Radio Model CM5905
S/N K51225644B

Any help will be greatly appreciated.

Thanks

Its an ES

[ethirtydavid]

If your unlucky, like me, the sticker on back with the radio code fell off.

[Jezza]

To OP and others I called the dealer and the gave me the code. But when I punch it in it doesn't work, it just gets mad at me. Is there some special way to punch it in?

s/n is f90555136c if anyone would like to send me a code to compare