How to Fix PSP 6.20 Games on Custom Firmware


Another Step in the Warez Arms Race

There was a time when a cracked PSP was an open portal.  The warez scene seemed to be one step ahead of Sony, who are extremely zealous about copyright protection, and you could play just about any backup without any hassle.  Required firmware updates have trickled down from Sony, each one required to play the latest game in an attempt to defeat the previous exploits.  In the past year or so, this practice appears to be rather aggressive, as each new game appears to require new methods of cracking.

One of our previous guides “How to get Dante’s Inferno Working on Custom PSP Firmware” showed a rather easy method to get nearly any game up to that point working on a custom firmware (such as M33 or Den-D), but since then new games have been published that require Sony’s 6.2 version firmware.  These new games utilize a new decryption method, and cannot be patched using Eboot Exchange 2.8.  Some of the new games that cannot be patched by EE are:

Screens from Prince of Persia – The Forgotten Sands for PSP

  • Iron Man 2
  • Prince of Persia – Forgotten Sands
  • Metal Gear Solid – Peace Walker
  • FullMetal Alchemist
  • What Have I Done To Deserve This, My Lord?
  • Hexyz Force

Screens from the Japanese version of FullMetal Alchemist for PSP

Of course, there are methods to manually patch your games (UMDGen 4.0, etc), but these are rather complicated, especially when compared to the ease of Eboot Exchange.  Another method to patch recent games is with the use of ISO Tool 1.51.  Not only will it patch 6.20 games to work on the recent custom firmwares, but it does it right on the PSP: no PC required!

Before you begin, you must know that this method does not work with Compressed Images (CSOs).  After you successfully patch the file you can create a new CSO to save space on your Memory Stick.

On the next page we show you how to perform the decryption and patch…

Page 1 of 212


  1. Arukanun

    June 20, 2011 at 1:19 am

    This is really works! XD
    I can play God Eater!!! ˆwˆ

  2. Ashley

    June 20, 2011 at 1:19 am

    Hey. I have a quick question. Do I need a memory stick in order to do this? Because when I plug my PSP into my computer via usb, all that shows up is a folder that says PSP and has system data and saved game files, but ms0: PSP GAME directory, or anything like that. Am I just missing a memory stick?

  3. Sara

    June 20, 2011 at 1:19 am


    it says the file is corrupted…

  4. Miles

    June 20, 2011 at 1:19 am

    It doesnt work with lego indiana jones 2 :(((

  5. zero

    June 20, 2011 at 1:20 am

    hey dude! i am using a cfw 5.50 w prometheus 4. but when i tried to run the iso_tool, it says curropted data? what should i do?

  6. gio

    July 9, 2011 at 1:08 am

    hi zero you must put the files of iso tool in psp/game/paste it here
    then it should be fine :)

  7. AKIV

    May 28, 2012 at 9:08 pm


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>