PS3 Update 3.21 Download Sites
This is not April Fool’s Day. This is real — you can download the PS3 Update 3.21 right now. From the website:
The next system software update for the PlayStation 3 (PS3) system will be released on April 1, 2010 (JST), and will disable the “Install Other OS” feature that was available on the PS3 systems prior to the current slimmer models, launched in September 2009. This feature enabled users to install an operating system, but due to security concerns, Sony Computer Entertainment will remove the functionality through the 3.21 system software update.
In addition, disabling the “Other OS” feature will help ensure that PS3 owners will continue to have access to the broad range of gaming and entertainment content from SCE and its content partners on a more secure system.
Download: PS3 Firmware 3.21 Update (US) / PS3 Firmware Update 3.21 (EU)