So, I'm from Sweden and I'm not used to talking about my car in English, so sorry in advance, but I'll try explain my problem as good as possible.

However, first I couldn't open my backdoors and left front door (just the right one), I could get the left front door open by putting key in and turning and meanwhile it's turned I could open it and the second problem was my tailgate opening for pretty much EVERYTHING. And when I close it - it just locks itself. (same as front door - got it open by turning key, but when closing = closed)

Can't open from inside nor outside.
However, I went to SM Bilar in Sweden, they're specialized on ctiroen&peugeout.

They managed to get the left front door working properly again. So now both my front doors are working. And they think that ALL of my lockcases are burned- but if all are, why are the front doors working?

However, if they would change it, it would cost 1800€ so they thought I should try doing it myself. But what do you guys think? Is it ALL the lockcases?

And how do I open my backdoors when it's "superlocked"? Is there an easy way?

Greetings.