Sony already pre-announced the new PSP Firmware 4.05 yesterday. 4.05 is now available for download from the Playstation Network.
For all PSP owners new music visualization features have been added. If you own a PSP-2000 with Wansegu Digital TV tuner in Japan then you also get some new features for recording footage from digital TV on your PSP.
There can now be multiple recordings scheduled and you can choose to automatically repeat recording schedules to tape series of TV shows.
Via the Playstation site (Japanese).
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