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It is not yet possible. Custom firmwares that allow you to play iso copy of games can only be installed on 5.50 official firmware for PSP 2000 and below and 5.03 official firmware for PSP 3000. You can only play UMD games.
You cannot play CSO files on official firmware. As of this date there is no custom firmware v5.51, so I suspect you have installed official firmware. If this is the case you will need Magic Memory Stick (MMS) and Pandora battery to revert to a previous firmware version. Pandora battery and MMS will not work on PSP-300x.
HELLO! There's no need to downgrade ur PSP. If u have upgraded ur PSP from the official site and a official firmware has been installed on to ur PSP, it won't execute games(ISO,CSO) from ur memory stick. It will only run games from the UMD. If u want to run ur games from a memory stick u have to install a CUSTOM FIRMWARE. Try www.psp-hacks.com these guys have many softwares on their site. Dont worry its not that hard to put a Custom firmware onto ur PSP.
because you update your psp to official firmware that why you connot run the games installed to memory card you going to install a custom firmware to psp so that you can play the of you psp using pandora battery and magic memory stick
hi your previous psp version is 3.80 m33 if yes your using custom firmware that why you can play game to your memory stick the problem is you upgrade your psp firmware to sony official firmware 5.01 you reinstall your firwmware again using custom firmware like 5.00 m33-3 cfw below with m33 or OE
The reading of ISO games doesn't depend on your memStick...it really is about the firmware of your PSP, wether it is a Custom Firmware (meaning it has been modded/installed with a hacked firmware) or an Official Firmware by Sony...If your PSP firmware version has a M33 suffix, then it can play most ISO/CSO games...on the other hand, if your PSP DOES NOT have a M33 suffix, then it is an Official Firmware by SONY therefore, it CANNOT play ISO/CSO games and other homebrew apps...
yeah, if your PSP is not Modded and it is running on official firmware of SONY, then you should prolly have it modded or have it made into custom firmware...If you don't know how to check the what firmware version your PSP is running...then here is how: open your PSP, then on the XMB, got SYSTEM SETTINGS then to SYSTEM information. on the top it says SYSTEM SOFTWARE, then check if your firmware version has a m33 suffix...if it doesnt have an m33 at the end, then it is an OFFICIAL firmware so have it modded, my friend...