Hi. I wanted to remove my head unit to fix a aux cable for ipod use. However, no matter how much I wiggle the removal prongs and pull the thing will not budge. I feels rock solid. The videos on YouTube show people pushing the prongs ibside snd outside: surely only one way is right? Does anyone have any tips? I've done this on other cars without issue so this is very frustrating. Is there a special Fiat only key?
Thanks in advance!

They are a bit tight.
Firstly, you need good release pins. For the blaupunkt head units they need to be nicely notched near the ends.
Push them in gently, until you hear/feel them click into place. If they are not far enough in they will not draw the holding tangs in far enough, if pushed too far, they jam things even tighter.
Once clicked into place, they need to be flexed outwards a little. This pushes inwards at the inner end, to bring the holding tangs in from the housing.
At this point, you now need to pull evenly, keeping the pressure outwards as well, while simultaneously swearing about the parentage of the designer. When it moves, try not to fall backwards.
As the unit comes out, the cables may not wish to follow easily. They pass downwards from the back of the unit, and are reluctant to come upwards, so pull and wiggle gently. The cables will allow the unit to come out just far enough to access the plugs, if you have tiny fingers with seven joints on each. More swearing is likely. Try not to allow the cables to disappear back in, fishing them out brings more tears.

Meanwhile, don't lose or break the little covers from the release holes. They are not too easy to obtain, only come as a set of four, and not cheap. If you've put them on the floor, try not to tread on them.

Do it now, before the weather gets too hot. Good luck.

Thanks for that. My pins are notched but maybe i ahould buy better. When the puns slip i am pulling out shavings of stereo cage which shows how hard I'm pull the damn thing. So the notched have to face inwards is that right? Cheers mate

Yes, notches inwards.
They engage on little tangs and the grip area is very small, so those little shavings will make it more difficult. Steady pressure and gentle wriggling is the way. Gentle jerking may help, but not if likely to slip.