Can it be that 3.21 OO PUP? That would be great not for the firmware itself but for the "achievement"...
this will not help us with the on line playing... reporting from demonhades translated:
It seems that for the invention of Geo in his "PUP" OO values modified with sony has put a measure that makes conditional, in this case has 3.2100 "(value" - "would indicate that if less than that shown , then it would require that we mention in the next line)
In short, the new measure would detect who has the PUP 3.21OO leaving them without service geo psn network.
Did someone really thought they could install custom firmware and then play online ? I'm pretty sure the waiting has no meaning for people wanting to play online. I guess the main reason for installing custom firmware will be running "home made" software & maybe "backups", but I think 360 is better (at least at the moment) and cheaper device for that. (Especially if you have "pre summer 2009 update fw" 360).
The pb is that now during the sign in sony somehow find a way to check the firmware you use.
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 ...