It seems that Firmware 3.00, released yesterday, has a bug and as a result Sony has released firmware 3.01 to correct this. According to the Japanese PlayStation Website the bug involves playing Jeanne D’Arc on firmware 3.00, which causes the PSP to crash during loading data from the UMD and does not return you to the game. Nothing else has been added to this new firmware update. You can download the update via the Japanese PlayStation site, as for the rest of the world, the update will be available soon through the normal channels.
[Via: PlayStation Japan]