YOU NEED CUSTOM FIRMWARE TO PLAY ISOs (Don't ask me how to get CFW, you can get it with pandora's battery and magic mem stick, just search on google and/or youtube for Tutorials on how to get CFW) 1. Get an ISO/CSO Game from somewhere 2. Connect PSP to ur Computer 3. Make new folder called ISO in the root of ur PSP's memory stick 4. Put the ISO/CSO file into this folder 5. Go to ur PSP and click SELECT in the XMB and switch to M33 Driver on the UMD ISO MODE (or forget that and play while having a UMD into ur PSP inside) MjaysTV