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Re: do it relly works?
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...
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is your PSP modified/CFW? if not it wont play cso or iso games. When u formatted your memory stick it will create ISO folder in the root of the memory stick. you said you created the folder, sounds to me that your not using CFW. this wont work.
If your using CFW/modified then format your memory stick using format option of your psp. Copy the cso/iso files to the ISO folder and that should work.
You have to make an ISO folder and put the iso files inside that folder. It has to be in the root of your memory stick or else it won't work. It probably got deleted when you formatted the Memory Stick.
Earlier Your PSP was installed with Custom Firmware. Thats why you were able to play Backup ISO's from Memory Stick. You have now updated your firmware to Original SONY firmware and SONY wont allow you to run Backup ISO's from Memory Stick.
If you want to play Backup ISO's again you need to install Custom Firmware