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"Those that absolutely must have the latest PSP firmware update may want to import Idolmaster SP. The recently released Japan-only game features a new update that isn't available online. Without an official changelog, the effects of the firmware are unconfirmed -- any guesses? Some are speculating that it could be a simple security fix, while others believe the update is necessary for PlayStation Home connectivity. Either way, PSP owners need not lose sleep wondering what's in this new (but rather inaccessible) update.[Via CVG]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2009/02/19/psp-firmware-5-05-released-available-on-umd-only/>