Bavaria C-III removal?

[benfidar]

I have a Bavaria C-III with four holes under the side covers instead of the two that I have seen in every tutorial. Anyone have any secrets to impart on how to remove the radio? I need the serial number to retrieve the code from BMW.

The crack in the bezel is unfortunate and predates my tenure!

[benfidar]

Took a while to get it to move at all. There are four sets of prongs. I used a 3mm allen key going from hole to hole. There must be a special BMW tool for this unseen for 20 years or more!!!