No, you must have at least 3.52 M33 Actually you can, assuming you have Official firmware 1.50 on your Psp and have installed Devhook. Even if you have devhook you can only play ISO's that devhook can support (up to 3.03).
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Unfortuantly fellow PSP player you yet cannot play iso's on your PSP. Persevere these few months until some gets a hack. To be on the safe side, do not upgrade your firmware. I really feel for you :).
iso is a file name so do u mean the iso folder or a iso game matter the iso folder can u get with custom firemware iso games can be downloaded from examlpe pirate buy but u need custom firemware or flashed psp
doing the download of ISO. FILES
You need to have a custom firmware to put iso/cso games. 1. put your psp in usb cable. 2. make a folder name " ISO". 3. go to Websitef to get your games then put it in the folder. 4. exit out then press select the you go to the 4th row the go to the secong last and put it no umb sony. 5. then you go to ur game folder and there you go ur iso/cso.
You make a folder called ISO in the drive on the memory card. e.g. E:/ISO Then you simply play the ISO off it