You know that reDRM dongle known as Cobra, well the people that create it are releasing a 4.30 CFW, removing the ability to play PS2 games on Non BC PS3′s, here is a quote from their site:
Cobra users will be pleased to hear that the Cobra USB CFW 4.30+ is currently being BETA tested. We are pleased to confirm that the PS1, PS2, PSP and all other Cobra USB features have already been integrated into our CFW.
Thanks to all Cobra users for their patience and support.
* Please note that PS2 games on non backwards compatible machines is no longer supported, since this functionality was removed in 4.30 OFW. *