It's a web portal; it's like a web page designed for your PSP, and stored on your PSP's MS. That's essentially what it is, besides the fact that X5 is awesome and most normal webpages, unfortunately, are not. So it's optional, and like all other webpages, will work on custom firmwares.

BTW, I will try it out as soon as it's released. Any chance of a taster for your loyal PSP3D fans?

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