Well, people, at last I managed to become a member. It took me a few hours to get the job done. I got errors all the time.
I was following this thread a day and I can happily inform you that I managed to unzip the files. I threw Elcomsoft onto the problem, and it got the job done.
I don't have a password, but Elcomsoft unziped the files with some keys (don't ask me how, but it worked).
I just need some instructions from anyone to upload the 3.7 gigabytes.
I have the Avic F930BT, but I am not so keen in testing the update myself.
Let me know..