That method, just flash it into Z540, of course it will unlock after this change, and it is not 804SS anymore.
But it will Never Unlock the real 804SS !
Guys, Search and try the solutions on this site......i found mine and it works fine via the codes..... just remember the VDJP code is 228 not the one in the posts....... i think i used one from the UNLOCK ALL NEW SAMSUNG PHONES...so it doeswork