Unfortunately my problem is not solved, B and e strings are still doing a metallic sound when I play them, not really a buzz but more a metallic thing.
I put a shim under the nut, which raised up the strings, but still the same. I've also put my hand inside the guitar to immobilize the cables inside while playing the strings at the same time, but still the same metallic sound.
I think I've done everything to try to locate the cause of this metallic sound, but unfortunately nothing improved it.
I will wait for the appointment with the luthier...
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