Originally Posted by caprice5a
They didn't "somehow" find the way - they have it at hand AGES ago and just not applied it right away after the lates FW release as it requires PSN update as well which happened this week. In EVERY communication with PSN during the authentication with Sony the current (actuall, NOT spoofed one) version is communicated to the Sony servers and they have at any time overview of every single user online which FW they're running and they can simply by "flipping the switch" at their server prohibit anyone with lower version to access PSN. Simple as that.
It looks like the influx of people spoofing the FW after 3.21 was released prompted Sony to act faster than usually (before it took a few months now not even a couple of weeks to blok older FWs).
Unless (if EVER) the encrypted communication during the authentication to to PSN would be cracked and properly injected / spoofed there is no way we'll be able to logon to PSN with older FW ...