There is a panel below the radio that you need to remove. It's held in place by 4 studs that just prise out, use a plastic panel extraction tool for this as you don't want to damage the surrounding panel.
Behind this you'll find 2 screws below the radio fascia, remove these and your radio can now be, gentle, pulled forwards.
If you hear a "clicking" type noise as you pull it forward then you are pulling the serrated optic cable against a strip that hangs down behind the radio, just put your hand in and free it off.
Hopefully that should sort you out.