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Are you trying to play the game from the memory stick? Or are you trying to play a game from the UMD and retrieve the saved game data from the memory stick?
5.00 m33 is a custom firmware that allows the PSP to play games stored on a memory stick. If you upgrade to 5.50, which is an original Sony firmware, that functionality will go away. If you have custom firmware, you should never upgrade it or the features like playing homebrew or loading games from a memory stick will go away.
First, try to determine your PSP's version. If it is the PSP 3000 (PSP slim with a narrow ring on the UMD Door), you can only play game demos from the PSN and can't be modded as of this date. If you have the PSP 2000 (slim with a wide ring on the UMD door) there is a chance you can't downgrade depending on your motherboard. Pandora's Battery and MMS is required to 'jaibreak' your PSP if you are on Sony official firmware.
Please check you update. If your update is low, you must upgrade it to 3.52 m33 then download a firmware 3.70 m33 or higher to get the m33 recovery.
As your PSP start press SELECT and you can see a menu then go to "UMD ISO MODE" from "normal" change it to "Sony NP9660" then exit.
Now enjoy playing ISO or CSO game. Happy playing.
For every newer game released you have to install the newest M33 firmware. M33-5.00-4is the newest. Check out www.pspiso.com. You can get the newest firmware and games free. Best site I have found. Hope that helps.
Someone will have to run the flash program to get you back to M33. Pandora battery and Magic stick with M33 flash on it. Most homebrew and programs will not run on any M33 version above 3.9. New UMD games from sony will have the latest firmware and the children will usually run the firmware upgrade to play the game. It will allow the new UMD to play, but the Sony Firmware will write over the Custom M33 firmware and you will not be able to run the games on your Memory stick.
ok update ur psp with a newr custom firmware ( i would say all the way to 5.00 m33-3 with 1.50 kernel addon) make sure that u have a folder in the root of ur psp mem stick that is called iso and put ur games in there.
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...