@gabrielesvelto That little metal bar is usually closed up against the module, so you can disconnect the fiber first and then pull the SFP module out separately, without pulling on the fiber. In this picture that clip has been wedged into the fiber latches, so the fiber isn't set properly, but also can't be removed, and the SFP won't seat right either. I think whoever did this did this will need to cut the blue plastic bits and re-terminate the fiber if they want to keep the SFP.