I'm in distress: I can't unscrew the EGR cooler

Yeah I have torx sockets like the ones I display in the picture below.
But they are of no use in this context, since they are not able to unscrew the bolts I hold a fight against.

sorry if I sound dumb, but I'm not english

71TgDju+2GL.jpg
Picture is female Torx. Your bolts require male Torx. Get the correct Torx and they will come ou.
 
I live in a small village in Spain... the local shop wants to charge me 110 euros for something similar
A quality Torx bit should be able to turn that out if you do heat/cool or soak it with penetrating oil. Torx bolts can stand a lot of torque.
 
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