I did it!
I tried the cid 111111 bla bla, and it was jut to much effort for a phone so i just went to imei-check and unlock everything. Damn! 40dlls, many Mexican pesos. So i installed the German version ROM and the F... 99999999 was still there!!!! I wanted to kill myself, monakh you were right. I opened the phone for like the 20th time and i knew it was hardware... and there it was, lead rust in the keyboard connector. I took a tooth brush, some alcohol and i brushed. Voilą! no more "9" I could have saved money time and effort if i just had looked close enough.
I'm happy i got into this, i love to learn new tricks.
You guys were really helpful, and a bit shady, i have to say.