Sorry, i was talking about the internal earpiece.

I solved the problem, it was all my fault.

I removed the blue foil from the speaker, because i thought it was some kind of protection and not the actual membran. I replaced the missing foil with another piece of plastic foil and now the speaker is working. It's still way too silent, but i think its because the foil is to thick. I'm getting another replacement, thank god, they are cheap to replace.