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Stemming from TheBuzzer?s original development on a USB Mod for SE-C, PSPSwampy has made a slight tweak or two resulting in 3.03 & 3.10 OE compatibility.

This plugin is incredibly useful if, a) you spend most of the time playing PSP in your tighty-whiteys next to your PC, and b) you have a small memory stick (don?t let that get ya down). When used in conjunction with a tool such as USBhostfs, you?ll be able to play ISOs off your PC?s hard disk over a USB connection. Of course this isn?t very practical when traveling ? unless you have a laptop handy? Whatever the case may be, enjoy!

PSPSwampy?s install guide:

Put the MS_ROOT files from the archive onto your PSProot (X:\)
Go into 3.10 OE-A recovery (Hold R on cold bootup)
Choose Plugins ?>
Enable usbhostfs.prx in both VSH and GAME
Enable buzzusbvsh.prx in VSH
Choose Back
Choose Advanced ?>
Choose ?Toggle USB (flash0)?
*Warning - you MUST do this next part correctly, or you are likely to BREAK your PSP*
On your PC, copy the file ?vshctrl.prx? from the ?Flash0\kn? folder and paste it onto your PSP?s Flash0 in the folder ?X:\kn\?. (where X:\ is FLASH0 of your PSP)
Run usbhost (or usblink etc) on your PC
Exit from PSP recovery
Now to use you can hold square and it will switch between usb and memorystick. (To make ?memory stick? refresh itself, go to the save data section than go back to memory stick.)
Download:
USB Mod v4b: http://www.psp-hacks.com/file/1066
USBhostfs for windows: http://www.psp-hacks.com/file/1063

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