1G a radio connector issue

[sakroda]

Hello, does anyone know what the square-shaped male pins on the far right at the back of the radio are used for?”

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[Nykky]

Hi, I have the same question with mine...

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AI says it's a 8 PIN male adapter for external sources (AUX/CD), but I'm skeptical..
I'd like to know if that's true, and if there's an adapter to convert it to a circular one (I'd like to add Bluetooth).

Hope somebody can help us.

:>

 

[sakroda]

I hope it s for cd changer box