PSP Official Firmware update 4.01
» 24.4 MiB – 432 hits – July 3, 2008
Sony’s official 4.01 firmware update for the PlayStation Portable.

* Display of search results under Internet Search has been improved for certain languages.
* Playback of video content under Video has been improved for certain file types.

  3.90 Firmware Update
» 24.5 MiB – 435 hits – February 1, 2008
Sony’s official 3.90 firmware update for the PlayStation Portable. Version 3.90 adds Skype support for PSP Slim models.

  PSP Offical Firmware update 3.71 (10392)
» 20.9 MiB – 67 hits – December 20, 2007
Sony’s official 3.71 firmware update for the PSP.

  PSP Official Firmware update 3.50 (2290)
» 4.7 MiB – 51 hits – December 20, 2007
Sony’s official 3.50 firmware update for the PSP.

  PSP Official Firmware update 3.40 (4030)
» 6.9 MiB – 73 hits – December 20, 2007
Sony’s official 3.40 firmware update for the PSP.

  PSP Offical Firmware update 1.50 (2867)
» 13.2 MiB – 70 hits – December 20, 2007
Sony’s official 1.50 firmware update for the PSP.

  PSP Official Firmware update 3.80 (218)
» 22.8 MiB – 182 hits – December 18, 2007
Sony’s official 3.80 firmware update for the PSP.

3.80 changes include:

* The function [Radio via Internet] has been added under [Network].
* The import of channels OPML format is now possible under [RSS Channel].
* Pictures can now be displayed under [RSS Channel].
* New visualization effects were added to the viewer under [Music].