Mediumgauge updated PSP Filer today, which is a file management app for PSP allowing users to edit, copy, delete, and move files on the memory stick and flash memory.

Download: PSP Filer v4.0 For FW 1.5 / PSP Filer v4.0 BETA For CFW [Right-click, Save as]

v4.0 Changelog:

- added a feature to modify CPU speed.
(Though UMD ripping feature always runs in 333MHz.)
- fixed a bug some kind of mp3 files that had LAME tags could not be played.

- added a feature to access ISO archive file.
(Those are read-only, and cannot be marked and sorted)

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