Wait... what? The Recovery folder (/PSP/GAME/RECOVERY) is used to store an EBOOT.PBP that can be executed from the recovery mode. That EBOOT.PBP is usually a flasher for a custom firmware or Dark_AleX's Generic Downgrader.

What I'd like to know is - where'd you get seplugins from? The seplugins folder is used to store PRX plugins for custom firmwares, and it's always placed at the root.

But if you want to know the complete filetree, then here it is -

MS_ROOT
-PSP
---GAME
-----UPDATE
-----RECOVERY
---GAME150
---GAME352
---GAME371
---GAME380
---MUSIC
---PHOTO
---THEME
---SYSTEM
-ISO
---VIDEO
-seplugins
-MUSIC
-VIDEO
-MP_ROOT
---100ANV01
---100MNV01
-PICTURE

That's just from memory... I think I missed something out somewhere, but that's basically what you need. The ones in italics (GAME150, GAME352, GAME371 and GAME380) are only used for the custom firmware they relate to. For example, GAME352 is only used for 3.52 M33, and GAME380 is only used for 3.80 M33. The exception is GAME150 - that's used for all custom firmwares with the 1.50 kernel, which is... well, all of them except 3.71 M33 and 3.80 M33. (But if you install the 1.50 kernel, then the GAME150 folder is needed again.)

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