Step 01: Download and install Type B Driver-English to your PC
Step 02: Backup and format your PSP drive.
Step 03: Connect PSP to PC via "USB mode in "XMB".
Step 04: Create a folder anywhere on your HDD or DVD-R/RW called "name_here".
Step 05: Copy the entire contents of the freshly formatted PSP drive
to the folder called "name_here". This will act as a PSP virtual drive.
Step 06: Copy all your ISOs/CSOs to the folder called "ISO" located at the root of the PSP virtual drive.
Step 07: Download
"USBMount 1.03" or newer if available.
Step 08: Copy "seplugins" from "USBMount 1.03" to PSP root drive.
Step 09: Download
"usbhostfs_PC_Win_1.5" or newer if available.
Step 10: Copy the contents of "usbhostfs_PC_Win_1.5" to the root of the PSP virtual drive.
Step 11: Restart your PSP while holding [R] to enter 'Recovery Mode".
Step 12: Enter "Configuration" in the Main Menu and set the "UMD Mode" to "-UMD Required-", and exit to return to the Main Menu.
Step 13: Enter "Plugins" in the Main Menu and enable "usbhostfs.prx [GAME]", "usbmount_game.prx [GAME]", "usbhostfs.prx [VSH]", "usbmount_vsh.prx [VSH]", then exit "Recovery Mode" to "XMB".
Step 14: First, make sure your USB cable is still connected, then execute "usbhostfs.exe" located at the root of the PSP virtual drive. You should now see a window on your PC screen that says a connection has been made.
Step 15: Insert a real UMD Game into the PSP.
Step 16: Press [Select] in "XMB" to access the "USBMount" Main Menu.
Step 17: Press [>] on the D-Pad to access your ISOs/CSOs and press [O] to select the one you wish to play.
Step 18: Exit the "USBMount" Main Menu and access your game from the "XMB:Game" Sub-Menu. Just like you would with a real UMD;/