Question about Sony PSP (Piano Black)

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My psp doesnt support iso games and its firmware is 6.37 how can i downgrade it

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U cant downgrade it.

Posted on May 20, 2011

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Well my psp at first had a version of 3.71(i could play iso games)... then i updated it to 6.00 (i can't play iso games)....now i want to make it 3.71 ....how is that possible?....could you tell me step by...


Hi There!
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!

Feb 03, 2011 | Video Game Consoles & Games

5 Answers

Problem with ISO/CSO game with PSP firmware 6.00


Make sure your games are saved in the ISO folder. Also, your UMD MODE should be set to M33 Driver or NO UMD REQUIRED. If you have Official firmware, you can't play ISO/CSO games. Wait for the release of CFW 6.00. Check out pspcustomfirmware.com.

Sep 18, 2009 | Sony PlayStation Portable (PSP) Console

6 Answers

No psp games


you had customfirmware and then you updated ot with officail firmware. you will probably need to use the pandoras battery method to play your iso games again.


google is ur friend

Jan 30, 2009 | Sony PlayStation Portable (PSP) Slim...

1 Answer

I upgrade my psp in version 5.01, now i cant play my games


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. 

Jan 30, 2009 | Sony PlayStation Portable (PSP) Slim...

1 Answer

Iso cannot be recognized in 5.02


you had m33 custom firmware(plays iso) installed on your psp and then you upgraded it with sony officail firmware(doesnt play iso) you will need to downgrade your psp

pandoras battery

youtube an google r ur friends

Jan 11, 2009 | Sony PlayStation Portable (PSP) Slim...

1 Answer

Iso/cso won't run to PSP version 4.20


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.

Jan 03, 2009 | Sony PlayStation Portable (PSP) Slim...

1 Answer

I can not play games which I download from the internet!


updating your psp to the latest firmware erases the cfw that you have before.you need to use the magic memory stick and the pandora battery to downgrade tne firmware.if you know somebody that do this thing then this solves your problem

Dec 17, 2008 | Sony PlayStation Portable (PSP) Console

1 Answer

GAMES FOR PSP 4.05


You need a pandoras battery + magic memory stick. Look on google, there are a million guides. This downgrades it to version 1.5, and then lets you add custom firmware.

Nov 12, 2008 | Sony PlayStation Portable (PSP) Console

1 Answer

Saving .iso games


if you're running the official sony firmware (not a hacked version) you might as well forget iso's and homebrew for now. you'll have to downgrade your firmware first then go back to a custom firmware. i haven't been keeping up w/ the psp hacking scene lately, and i'm not sure what is the latest firmware that can be downgraded. a good place to check for more info is psp.qj.net as well as their forums. hope that helps!

Jul 09, 2008 | Sony PlayStation Portable (PSP) Console

1 Answer

Games on memory card not running


well of course it wouldnt work
4.01 is an official firmware
u need to use a custom firmware
and since there is no custm 4.01 yet, ur gonna need to downgrade ur psp using a downgrader
i reccomend despertar del cementar v5

Jun 26, 2008 | Sony PlayStation Portable (PSP) Console

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