Huh? How would you do that? The only way to connect is to have your PC pretend to be Sony's authentication server. The SSL certificate that gets replaced in the PS3 lets it think that your PC is really $ony.
Charles Web Debugging prog performs the MITM by modifying the headers to change your f/w version to 3.56, and feeds the PS3 with a fake update_list that tells the PS3 that the current f/w is 3.21. So the PS3 connects. $ony can stop this in a second.