Originally posted by larrylje:

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Follow the below steps to recover to 1.50...

First off make sure your PSP is plugged in to the AC Adapter. Keep your PSP plugged in the whole time you are doing these steps.

The PSP also needs to have a battery charge level of 75% or higher. To check the Battery level go to your system settings then battery information. It will give you the % level there. If it is lower then 75% turn off the PSP and let it charge till it is over 75% (I would recommend charging it to 100$)

Now it is time to downgrade to 1.50

Format your memory Stick using PSP system settings.

Download this RECOVERY file.

Extract the file which will extract a RECOVERY folder. Now connect the PSP to PC via USB. Place the RECOVERY folder in the /PSP/GAME folder of the PSP Memory Stick.

Now go to recovery menu.

Do this by turning off the PSP. Hold the power button up till the power led turns off. Now hold the R shoulder button down and keep it down while turning the PSP on.

The Recovery menu should come up. When it does select the option "RUN PROGRAM AT /PSP/GAME/RECOVERY/EBOOT.PBP follow the on screen instructions and it will downgrade your PSP back to 1.50 firmware (After it downgrades you might get a blue screen with a bunch of text. If you get this screen just hit O and the PSP will reboot and you will need to enter your settings).

Go to the System Settings then system information and make sure it says 1.50 before continuing to the above guide to go to 3.52 M33-4.


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Below is the files and directions to update to 3.52 m33-4.

3.52 M33 HERE

3.52 M33-4 HERE

3.52 firmware HERE

1.50 firmware HERE


Download the 3.52 M33 CFW linked above. Extract the file.

Download both the 1.50 and 3.52 firmware. You need to re-name the 3.52 firmware to 352.PBP the 1.50 firmware to 150.PBP. Then add them to the M33CREATOR folder.

Now copy the M33CREATOR folder and the kxploitpatcher and kxploitpatcher% folders to the PSP MS directory of ms0:/PSP/GAME folder.

Now go to Game Menu Memory Stick and run the KXploit Permanent Patcher (There is 1 that says corupt data this is normal). It should run and say patched successfully and reboot back to the XMB.

Now go to game Menu Memory Stick and run the M33CREATOR.

After you run the M33CREATOR it should reboot back to the XMB. It should have created a 3.52 M33 update which you need to select in the Game Menu Memory Stick.

It will flash the files to the PSP and you should be at 3.52 M33 firmware. If it is then format your MS.

Now extract the 3.52 M33-4 update.

Drag the PSP folder that is in the update M33-4 into the root of the MS overwriting the files when it asks you to. Now go to Game Menu Memory Stick and run the m33-4 update. This will only take a few seconds.

After the update is finished check and make sure it says 3.52 M33-4 for firmware. If it does say 3.52 m33-4 then format the MS 1 more time.

You are now updated to 3.52 M33-4.

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Originally posted by Chandler8:

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many thanx, I think this's what I really want, just one last question before doing this ( just to make sure) I'm really interested that my PSP runs PS1 games (EBOOT.pbp files),
so if this PSP V3.52 M33-4 does run PS1 games(EBOOT.pbp files), then well done! I'll do the steps.
if not, well what's the deal???

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Originally posted by Chandler8:

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the thing is, that I've upgrade my PSP to OE-B
and I put the game file in the (OE-B update folder) and I replaced it with the first file (EBOOT.pbp), and when I run the game this error appears: 80010002

Now, I've done what you told me, and put the game file the game folder (which was empty) I made a folder with the name of the game, and put the game file in it.

when I went to games menu I found the first icon (OE-B update) is a: curropt data, and I found a new icon for the game, I run the game and this error appeared: CA000005

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Originally posted by guano:

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Weird. I know if you're on 3.52 M33, you don't need the keys.bin anymore. :D

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Originally posted by Chandler8:

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what's the difference between V3.52 M33-4 and V3.52 M33?
I think I'm gonna upgrade to V3.53 M33-4 and I hope that it runs PS1 games (EBOOT) not only (ISO's)

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Originally posted by Chandler8:

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I didn't find the recovery.zip file from the net, this's the link, and it's written the download link is below, but there's nothing below!!!

http://www.sendspace.com/file/j3j2e2

Originally posted by Chandler8:

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where can I find this (key.bin) files??

when I downloaded the silent hill 1, it came only (EBOOT.PBP) file, there's no key.bin files, from where can I get them???

I have silent hill 1, and resident evil 3 nemises, so if any one have these key for these games, just send them to me, and I'll be greatfull,

or if you have any links, I'll be greatful too

waiting for a reply....................thanx

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