Hi MaLd0n,
Thanks for your reply.
Sorry for my late answer about your solution.
I've tried the file you've provided and it works like expected.
However, i notice that i'm still unable to boot whithout the usb key, my 3770k proc. is only 4 cores in "about this mac" and sound (ALC892) does not work.
I can also connect to my icloud account, but not to i-message or facetime and my ethernet card is set to EN=0.