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Honestly, downgrading the firmware is tedious compared to upgrading it. I would suggest you have someone who has the technical knowledge to do this. Failed downgrade could lead to a bricked psp. Which will render it useless. Some can be reflashed and will work back while some cannot.
However, you can purchase a Pandora battery for you PSP. Remember: You CANNOT downgrade your PSP with any firmware higher than 3.50 without a Pandora's Battery. You may check this link for a self-help guide in making your own Pandora battery. This is for a PSP slim model. http://forums.maxconsole.net/showthread.php?81424-How-to-create-a-Pandora-Battery-and-Slim-Mem-Stick-WITHOUT-a-Phat-PSP!
Hope that helps!
Your CSO/ISO files should be in your ISO folder in the root of your memory stick. You might have to make this folder if you don't already have it. Also, your UMD mode have to be set to NO UMD REQUIRED, or M33 Driver. You must have Custom Firmware to play ISO/CSO games.
You cannot play .iso or .cso files (or any homebrew games) on your PSP unless you have firmware 1.5 or a custom firmware. Any "off-the-shelf" firmware such as 4.2 will not support these types of files. They will just show up as "Corrupted Data".
You can go through the process of downgrading your firmware from 4.2 to 1.5, then from 1.5 you may upgrade to a custom firmware such as 5.00 m33-4. Doing so would require a good deal of technical know-how and a LOT of patience. If you do not want to risk ruining your PSP, do NOT try this. Research methods of downgrading such as "Pandora's Battery" and other firmware downgraders.
You were able to download games from the PSP website because they are programmed to play on the current firmware. Even if you were to (somehow) properly convert the .iso or .cso files to an EBOOT.PBP file, it would not run unless you have firmware 1.5 or custom.
IF YOU WANT TO THE OLD VERSION BACK AND PLAY AGAIN...... HOLD THE SWITCH UPWARD AT THE SAME TIME HOLD THE L AND R BUTTON AFTER THAT THE M33 RECOVERY MENU APPEAR... IF YOU HAVE SOME QUESTION JUST EMAIL AT SPONG3BOB11@YAHOO.COM
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
your ISO Games....
Presumably these are 'backup' of yours or others games ??
Do you have 'any' level of homebrew installed to be able to read your ISOs ??
If this is the case - you will need to revert back to the original firmware. . . if you need more detail, please comment.
you have to have a custom firmware psp, google it if ya dont know what that is, when yout psp is on custom formware you format the memory stick and you get the iso folder on the root folder you just put the games on there using a usb cable.