UPDATE NOW AVAILABLE:
PSP Firmware 2.81: Japanese | US | European | Chinese

Sony Computer Entertainment (Japan) released today a new PSP system firmware version 2.81. The new firmware however is basically a patch added to address security vulnerability in the system software. In addition, the new firmware will rectify issues pertaining to reading Memory Stick PRO Duo with more than 4GB of free (recordable) memory space.

PSP FIRMWARE 2.81 UPDATE INFORMATION PAGE:
Japanese | US | Europe | Chinese