Upgrade Your PSP From OE firmware to 3.52 M33
After Dark_Alex retired from the PSP homebrew scene, many people thought it was the end of the custom firmwares released by him. But it was not so, a few days later a Russian hacker team called M33 debuted their own custom firmware, which has now superseded Dark _Alex’s OE firmwares as number one. They work very hard on this firmware, and they make no profit from it. So I highly suggest that you visit their page, and make a donation so the M33 team can continue hacking the PSP.
It took me some time to figure out how to install this update on my PSP, because of a small misunderstanding. When you download the Update #4 (M33-4) file from any of the PSP sites, it is not the installer. This file will only patch an existing M33 3.52 firmware PSP with the new version. To save people a lot of work, I decided to write this tutorial which includes all the necessary files in one location. But first we need to make sure that your PSP satisfies the basic requirements.
- Make sure you are running the one of the custom 3.x0 OE firmwares (or an older M33 firmware). If you are running the official Sony firmware, check out this forum thread on PSP Firmware Downgrading.
- Make sure you battery is at least 75% full. The simplest way to make sure is leaving your PSP charger plugged in during the upgrade.
- You also need a Sony Duo Memory stick with at least 128 MB of free space.
First download the Zip Archive containing all the necessary programs for the upgrade. The archive avaliable on this website includes the M33 Creator, 1.50 and 3.52 official firmwares, and the M33 Update #4 patch. They are all necessary for a successful upgrade. You can download it from one of the following website:
http://karkri6.freehostia.com/download/3.52%20M33-4.zip
Mirror: http://files-upload.com/files/461107/3.52 M33-4.zip
Extract all the files onto your PSP in the PSP/GAME150 folder. It has to be the GAME150 folder, otherwise the upgrade file will not start. Next disconnect the PSP from the computer, and look into your application tab in the XMB menu. The application you want to launch is the “M33 Creator”. Let it run for a few minutes, and in the end you should see a message telling you that the upgrader was created successfully. If you only see a black screen for a long time, don’t do anything. This is perfectly OK, because the M33 Creator is doing it’s work in the background.
The next step is to run the actual upgrader. Look into the applications menu again, and you should see another application called the “M33 Upgrade 3.52”. After you have run it, you will be shown a disclaimer and asked to press the X key to confirm. Then after a few minutes (you might just see a black screen again) the upgrade will be completed, and you will have to press the X key again to shutdown your PSP.
Now you have the 3.52 firmware, but you still have to apply the M33-4 patch. This patch will fix any bugs since the original release, and it will introduce a few more features. The procedure to apply this patch is quite simple; just navigate into the applications menu and run the app called M33Update #4. In a few seconds a message will tell you that your PSP has been patched successfully, and pressing X will turn off the PSP. Finally you have upgraded your PSP to the latest and greatest custom firmware.
Make sure to check back often for updates on M33 firmwares, and all-in-one packages! And if you come across any problems with this tutorial, I suggest you visit the urPSP forums and post your query there.
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Thanks so much. The pack was all-in-one that the link you gave was for, the instructions kept it “keep-it-simple-stupid” and it was so easy with the well written instructions.
It worked perfectly!!!!!
i followed these intructions but cannot get the patch to run my psp is showing as 3.52 m33 i want to upgrade it to 3.71 but cant go any further untill i can get the m33 patch to work i am putting it in the right folder but not showing up on psp as an update i get a calender instead, and help is much appreciated
yes it works but the first upgrade took at least 10 mins or more to complete. i was just about to shut it off when it said it was complete.(nearly a big mistake there!!!). got to be really patient! all in all a good and sucessful upgrade!!!!! thanks!!!!
you should also tut folks how to revert back to 1.5 if they are unhappy with these m33 releases
Sounds like a good idea, but I have never downgraded to 1.5 from custom firmware before. But I’m sure that such a tutorial already exists, I seen a ton of downgrading ones in the forums, so I’ll find a good one and link to it.
I can’t find a firmware downloader. I’m running an official sony firmware 3.95. I’m a noob and need help.
you need to downgrade your psp to 1.50 OE o that it can run the updater without being blocked. i hope that helped…
can u send me a link so i can do that? im just like the dude u replied to aboe
your link doesn work properly, can you re upload to another place like sendspace or something?
Works well here. Maybe they had a outage when you tried to download it?
I have to go somewhere now, but I might be uploading a local copy that will definitely work when I get back. 🙂
Thanks for the guide 🙂
Is there another place I can download the zip archive from? I can never get more than 100Kb of the file before the download stops.
Cheers!
Try the new download link. I have uploaded it to the local sever, so it should work 100% now.
I had copied the files into my PSP but can’t find the applcations tab!! I am running 3.40OE A 🙁 Please help!!
The application tab is from where you launch your games and demos.
i updated my cw to m33 3.52 but now i cant run my iso games. where do i put iso’s and what do i do?
Place the ISO files in the ISO folder on your memory stick. Then they will appear in the game menu of your XMB. If you get an error when you try to launch them, then see this post:
http://www.krizka.net/2007/08/27/error-80020321-when-lauching-an-psp-iso-game/
What is the chance of bricking your PSP this way?
Since this version has been around for quite some time, all the bugs have been ironed out. This means that the change of bricking your PSP is quite low, as long as you follow the instructions to the dot.
Of course, if you have a friend with a working PSP, and you manage to brick yours. Just get his help with the Pandora’s Battery to unbrick your PSP.
I thank you sincerely, I am now the proud owner of a 3.52 M33-4 PSP.
THANKS!
I’m running 3.03 OE-C and I’m not sure if I can update directly. I know you said there 3.x0 OE. So… what am I suppose to do in this case?
You can upgrade directly from any firmware that allows you to run homebrew. 🙂 SO yeah, your 3.03 OE will work too.
Hey.. thanks. I did it and it works really nice.
Just wanted to say THANKS! I did it just as you said, and it works really well.
Just wanted to say you helped me BIG time!! All your articles are brilliantly simple to understand and mightily useful.
Thanks a million!!
So… There’s a new M33 firmware out (3.71 M33). I was just wondering… Will you cover this too?
I’ve already succesfully upgraded, but it mightn’t be that simple for other people.
Now it’s just to wait for the 3.71 1.50 support patch… But knowing team M33, that won’t take too long.
PS. Was quite a bit of a shock to see DA was actually part of team M33! Ahh well, now at least everyone can know for sure how good team M33 is. 🙂
Haha yup, I haven’t been reading the PSP hacker sites in some time (due to busy schedule), so I was totally shocked when I saw the news on digg.com. I’m going to update the guide this evening.
If the PSP stays saying writing 3.52 firmware what does that mean its been doing that for 10 minutes and I have an OE firmware previously can I still recover it if it bricks?
If the PSP stays that way, you probably bricked it…
In order to update to 3.71 M33, you need to be on 3.52 M33-3/4. Although it isn’t in the readme, it’s been said numerous times.
Do you know someone with a Pandora battery? If so, ask him/her to fix it, or try to get him/her to lend it to you to do it yourself.
Good luck…
PS. Is there a Pandora creation guide in the planning?
Yes, there should be a Pandora guide coming soon. My sister recently also got a new PSP, and from what I know it has a newer firmware. This means that Pandora might be the only way to downgrade it.
Thanks for the info about 3.71 M33.
Hi Karol,
After updating to a cfw 3.52 M33-4, does this actually display 3.52 M33-4 on system software info? or it will still display 3.52 M33?…
Basically how do i differentiate a psp with 3.52 M33 vs 3.52 M33-4?
thanks.
It should display the -4 after the version, as far as I know. I don’t have a 3.52M33-4 PSP, so I can’t check. sorry
It displays 3.52 M33-4 in the system settings.
Oh, and you might want to consider to upgrade to 3.71 M33 with the 1.50 patch. It works perfectly (although it doesn’t display whether the patch is installed or not).
I just did the following update and got my psp to 3.52 m33-4 and i thank you for that now when i try running the 3.71 upgrade it says i need a 3.52 m33-3 or higher firmware to upgrade, can anybody help??
Hmm…
Seems like something is corrupt there… Are you sure you have the actual Patch #4 installed, and not just 3.52 M33?
Do you have a Pandora’s Battery? If so, it might be possible for you to upgrade the hard way (through the UPDATE folder), with offcourse the risk of bricking.
Is there a recommended settings for cfw 3.52 M33-4?
Nope, just play with it until you find something that suits your needs.
You might want to check my list of useful settings though:
http://www.krizka.net/2007/08/31/useful-settings-in-the-psp-recovery-menu/
Recommended setting? Be a bit more specific, please.
This tut is a great find for me, wanting to run SWB Renegade Squadron which will not work on my existing firmware.
I am therefore wanting to upgrade from 3.40 OE-A to 3.52 M33.
Following your instructions but my Memory stick does not have a PSP/GAME150 folder, instead it has a PSP/GAME folder. Should I use the GAME folder or create a GAME150 folder to extract the files to?
I could try either but too scared!
The folder will not exist if you have not formated your memory stick while running the OE firmware, because it is their addition. You can create it manually. 🙂
All up and running now, I am grateful for the help you have posted here!
Two further comments to possibly help others, copy the folders directly into GAME150, and the M33UPDATE#4 appeared as an untitled application looking like a calendar dated 33.3.33, this is actually the update#4 file.
You should be able to safely create a GAME150 folder.
It is strange that you don’t have one yet, though…
whenever i try running the 3.52 M33UPDATE it keeps saying “battery has to be at least at 75%” but my battery is more than 75%, the psp is even charging while im updating. how do i fix this?
nevermind about the battery thing i just had to wait for it to be fully charged. but i have another problem. after it updated to 3.52, i cant find the M33UPDATE #4. what should i do?
ok i found it. it was just the one with the calendar. hahahaha
but i have a question, after i update it can i delete all the update stuff in the application? cuz it uses up some space, if i can please tell me how to do it properly
You can safely delete it.
i just delete it from the game150 folder?
Yep. You can just safely delete all the files you used for installation, even the generated installer.
Just don’t delete flashO/flash1 files.
PS. You could also just format your memory stick with your PSP, if nothing important is on it.
PS #2. Did you know 3.71 M33 is out? Installing that, plus the M33-2 patch, AND the 1.50 kernel patches, might be good for you too. I myself find the new function to do things whilst listening to music very interesting. But hey, you decide. 🙂
where can i get those?
Where can you get what?
Did you mean the 3.71 M33 files?
You can get those files all over the internet. Check out Karol’s tutorials. There’s a lot of 3.71 M33 info there.
You’ll need 3.52 M33-3 or -4, but that shouldn’t be a problem for you. 🙂
Dark_Alex is M33! It’s long known. Check the web buddies.
I’m guessing (and hoping 🙂 Karol will update this part of the site soon.
Awesome Guide. Looking at other websites it look hard but you made it so easy so any noob could understand as well. Gotta love the firmware.
i just updated my psp to this version. the iso and games work but the internet browser doesnt, wen i try opening it it shows a blue screen that says sumthing about the default settings then hangs. how do i fix this?
I’d say something is corrupted… The BSOD is usually a sign of either a semi-brick, or corrupted flash memory.
My only two ideas are:
1. Re-install the firmware. A hard re-install with Pandora comes to mind…
2. Upgrade to 3.71 M33. The installer can fix a LOT!
Please I need some help: I just upgrade my PSP to 3.71 couple days ago and I can’t play my ISO games it said corrupted data everytime I tried to open it, but my music and video work fine .
Where do you keep your ISO files? In the ISO map in the root of your memory stick?
Actually I did download 3.71 from PSP official website it wasn’t from m33 site.Anyone can help me to fix it please. Can’t open file under GAME>MEMORY STICK keep say corrupted data.
thank.
You going to have to find someone with a Pandora’s battery to downgrade.
what’s Pandora’s battery? how or where I can get it.Please help. Thank.
http://www.noobz.eu/joomla/news/unbricker-for-all-firmwares.html
This tells it all 🙂
Oh, and if you need additional how-tos, check out these links:
http://www.dcemu.co.uk/vbulletin/showthread.php?t=72026&highlight=pandoras+battery+tutorial
http://www.pspmod.com/forums/psp-hardware-guides/23428-guide-making-pandoras-battery-new-method.html
Especially the first link is worth noting, although the second one might help ya out if you don’t have a homebrew capable PSP laying around, and are willing to take the risk.
If you’re gonna get to doing this, good luck. And don’t forget to use a Pro DUO memory stick! 🙂
Take a look here, it is a very good guide/forum.
http://www.pspmod.com/forums/psp-hardware-guides/23428-guide-making-pandoras-battery-new-method.html
Nice Tutorial!
I am running custom firmware 3.10 OE-A.This is very easy tutorial.I am so glad that I found it.My previous hacking done by one of friend, but I wanted to this hack by myself and don`t know what are chance that this could get wrong and I can have my PSP bricked, even if I have done everything right.
Definitely a very easy guide & I too have successfully upgraded from 3.04OE-A to 3.52M33 & then to 3.52M33-4
However I am experiencing problem with now upgrading to 3.71.
Even now my PSP states I have 3.52M33-4 however when I run 3.71 update it says that I need 3.52 m33-3 or higher, then the PSP restarts back to 3.52M33-4.
Can some one plz assist ?
Hey, i had the exact same problem.
turn the PSP completely off. restart and hold “R” to enter recovery mode. under configuration, change the “kernal” from 1.50 to 3.52
i thought i had done something wrong myself, but this works flawlessly
😀
The chances of having your PSP bricked are always present. By following this guide to the dot, though, you don’t have THAT much risk. I’d say you have about 95% chance of everything working O.K.
Ofcourse, having a friend with a pandora’s battery (or having one yourself) can help in case something goes wrong. Then your security goes up to 99% 🙂
Oh, and check out 3.71M33 some time. It owns! Just make sure you’re on 3.52M33 with patch 3 or 4 though, before even trying to upgrade.
Worked like a charm (upgrading from 3.03 OE). One thing – is it okay to delete the M33 folders from the GAME150 folder once I am done or do they need to remain there? Thanks!
Yup, you no longer need them.
thank you soo much, i have upgraded to 2.52 m33-4, you’re the best! thanks also to m33 team! more power to you guys! you guys r the real deal!
Pls. help me my psp 3.40 OE-A upgrade to 3.52 M3 then i update to M33-3 the system of my psp hang up. Pls. help i’m hoping for immediate response…
Will this method work with a 3.0x OE-c firmware version? I’m in desperate need of an update but I don’t want to mess up my PSP so I’m being SUPER-careful.
Hello Sir!!
Sorry but i’m a newbie in PSP Firmware Upgrading or Downgrading. But could someone help me please??
Here is my case:
I have an old PSP type Fat . Version 3.52 ( I think its the OFFICIAL SONY VERSION )
Then i wanted to update it to v. 3.71 m33-3..
and i read your tut that i need an 3.52 m33-3 or higher version to do it…
any instructions or suggestions to upgrade OFFICIAL SONY 3.52 to 3.52 m33-4??
I acknowledge you site with greatness!!
Cheers!!
Hi ….I have been reading on sites like these all day…..ugh. This one seemed the most organized, but I still have no idea where to start….I have official Sony firmware 3.71. I checked out the forum link provided above…but I have no idea what to downgrade to??? if someone would be kind enough to advise me on what to do….I would really like to check all of these features and possibilites out, I just do not know where to start. Have a good one…
Hi, do you have the slim or fat PSP? If you have the fat, you need to downgrade to firmware 1.50. I compiled a list of guides here:
http://www.krizka.net/2007/12/09/installing-custom-firmwares-on-373-psps/
With slim, I am not too sure because 1.50 does not exist there. However you still need to use Pandora’s Battery, which is what the above list of guides are for. I recommend checking out the pspmod.com forums.
Hi there. Thanks for the guide. It works! XD
Though you might want to add that the calendar thing is actually the M33Update #4. ^^
Cheers~
Hi,
I just upgraded to 3.52 m33, can I update that to m33-4 after the first upgrade or did I have to do it all at the same time?
Any help will be appreciated. Thanks!
You can upgrade to 3.52m33#4. 🙂
Hi Karol,
I apologize for a really dumb one: I installed 3.52 M33 from 1.50 following the tutorial and now the system information says FW 3.52 M33. Unfortunately I must have overlooked something because I can’t start anything from the stick – not even the Upgrade-4. It always comes back with error “The game could not be started (80020148)”. As this was my son’s PSP, I’m afraif I’m in deep trouble now. Is there any way out of this? Can you help to make it play?
Thanks a lot in advance,
Frank
I don’t think that you bricked your PSP because it still starts up. 🙂 Just make sure you placed the update into the PSP/GAME150 folder (create it if it does not exist).
What other games give you the error? You might have placed it in the right folder (GAME352 vs GAME15).
Thanks Karol,
Creating the GAME150 folder did the trick!
thanks so much! easy to follow simple guide.
worked perfectly!
Hey guys
i just having a probs with my psp.
when i try to run any game from my mem stick then it says “the game could not be started (80020148)
plssssssss helpppppppppp
Hey guys, iv been searching everywhere for a solution and couldnt find a straightforward guide that suits me. And i remembered this forum and how many times it has saved my life, 🙂
here it goes;
i have a psp version 3.71, and i have to downgrade it. Apparently the only way is use ‘pandoras battery’, and i read you need another psp (Which i do no have/cannot get/borrow). So i would like to know if there is a way, and a step by step guide ( i can be a bit slow sometimes, bear with me please).
I have 1 Gb memory stick and the original psp.
It’s possible to hardmod your battery. See my post about different Pandora’s Guides here:
http://www.krizka.net/2008/01/22/going-from-380-to-380m33-on-your-psp/
hey guys
i have a 3.40 OE-A firmware in my psp. i extracted the files in the GAME 150 folder but it still doesnt show me anything in the XMB application menu. i am in serious need of an upgrade. guys pls help me out as soon as you can
I have a launch PSP (fat) with orginal sony firmware 1.5.
I’m a bit confused b/c most tutorials are for PSPs with higher official firmwares.
Your link on PSP downgrading is dead.
Do I still need to “downgrade” my 1.5 psp to a custom 3.x0 OE firmware in order install 3.52 M33?
When I used homebrew I used devhook, but I’ve been out of the scene for a while and the homebrew scene has totally changed.
If you can point me in the right direction, it would be much appreciated.
Thanks.
I am quite sure you can go directly from 1.50 to 3.52M33, since the installer still uses the 1.50 kernel code. I also think that I done the same before on my sister’s PSP, so it should work.
PS: Thanks for pointing out the broken link, I’m going to find a new one soon.
Thanks for the quick reply.
My 1.5 PSP doesn’t have a GAME15 Folder, so i made one manually and extracted the contents of the zip….
My xmb doesn’t have an “applications tab” to launch the M33 Creator.
So what I did was extract the contents of the 3.52 M33-4 into my GAME folder…
I can then see the M33 Creator in my xmb under Games, but when I launch it it says “Game could not be started.” I tried with and without a UMB inserted.
Any ideas what I’m doing wrong? Sorry for the noob questions.
You should have extracted it into the PSP/GAME150 (yup, create it if it does not exist) folder and not PSP/GAME folder. Also Applications tab == Games tab.
I’m in the same situation as insult, I have a lunch 1.50 firmware PSP. I’ve downloaded your files and created a GAME150 folder, but the PSP does not see any games/apps from that folder. If I put it in the GAME folder I can see the apps, but they cannot launch correctly.
Any ideas?
hello i am a complete newbe when it comes to psps in general. I have a psp version 2.80 how and where can i upgrade it to 3.52 m33-4.
this site it well layed out when i do get up to scratch it can see this site being very helpfull
worked !!
Any advise whether i should now upgrade to 3.71 ?
How long does it take for the 3.52 to write firmware been waiting for over 15 min. light still flashin, says writing 3.52 firmware?
I don’t exactly remember, but it did take quite a long time. All I can tell you is that if it takes an hour, then something is wrong. :S
tnx i can now play my cso games…your intructions is so easy..
tnx a lot
Thank you! This tutorial is very well written.
I am experiencing a problem. After i run m33 creator, appeared on the screen small white letters. But, after a while, it has gone completely black, with no flash lights indicating it is turned on (only the power orange light). Did it finished already ? or something went wrong ?
Thank you.
Everything ok! my mistake!
hi,
i have a psp fat with official firmware 3.52 and want to change to cfw 3.71 m33. at one of the website i read a warning that a psp with the mother board no. as ic1003 which is same as mine cannot be degraded other wise they end up bricked.so how can i change my firmware without degrading.
Great simple instructions. Nice work. Thanks!
Hi, does it format your memory stick in any way?
‘Cse I want to use the memory stick that I use for playing games and I am afraid that my Saved Data may be lost during the upgrade.
Just backup the contents of your memory stick to your computer before you attempt the upgrade.
While I was attempting to copy the files, I get the error: The device is not ready.
Any suggestions?
While waiting for the actual upgrade, i impatiently pressed up, left, down, right on the d-pad out of fear of the lack of response my psp gave me… Did this mess up my psp or should i keep waiting and hope?
thanks for the guide works absolutely perfectly – some advice – be PATIENT while waiting for the creator to run, took about an hour on my psp for some reason.
thanks again
I actually don’t think this guide is perfectly clear. I don’t know what directory to extract the files to because the zip file has multiple directories within it. Do I extract every file from every folder within the zip file to /psp/game150? Wouldn’t some of the files be overwritten? I want to try this, but I’m still not sure…
After I did all this I turned on my psp and none of the buttons worked, what can I do???
After I did all this, none of the buttons would work, what can I do?
Oh dang thanks alot =D
Ur links aren’t working so do i have to click on them or wat……plz help!!!!!!!
Excellent!! very clear and easy to follow instructions.
Thank you.
Mozte mi poradit mam system software 5.01 a mal by som ho zmenit na M33.som zaciatocnik a vobec neviem ako to urobit spomina sa tam aj firmware.prosim poradte mi dakujem.
hey dude, i like ur tutorial, but, i tried to launch the M33 creator, but after about 5 seconds after i clicked, i get a message saying “The game could not be started. (80020148)” what does this mean and what should i do?
you need to creat a folder called GAME150, other than the existing GAME folder
May the Spirir of M33 never fall! Thank You very much u have my blessing!
WOW!
thanks a lot..
jancok asu raimu gateli
man i thank you very much i love you for this i looked on the internet for days and finally i found it very clear and easy t understand i will tell my friend here in panama about your site
se le quiere mucho y muy buena suerte amigo
I’v looked everywhere and couldn’t find the answer? i upgraded my psp froma ver1.5 to 3.40 OE-A. when i want to run 3.52 m33 creator it keeps telling me “the game could not be started (80020148)”. now all the tutorials i see about this problem already have the m33 installed i think? it’s been a really long time i haven’t hacked my psp so i’m a noob now can anyone please help?
NVM thanks alot i figured it out
i’m running in m33 3.51, but i cant upgrade it to anything else. when i try with the m33 creator for 3.52 it saids “the game could not be started. (80020148). would some1 pls tell me what to do here?
I have a PSP fat 3.03 OE-C. Do I still need a Pandora Battery & Magic Memory Stick to do this tutorial?
I’m new so, I’m scared to try what I’m not sure about.
Thanks!
Hi guys, I apologize in advanse, my system software is 5.03, do I need to downgrade firs and if so could I get a link. Please
thanks dude, i have successfully done it without bricking my psp :D.
can anyone post pictures of their results.. i wan’t to see the features 😐
sry. just not sure if i’ll do the upgrade properly.
hey pls kindly help me thx …. if i update my firmware from 3.51 to this 3.52 k i stil play my pirated game … pls reply i will apprecieate it thx man …
hey pls reply me this question thx man … if i update this firmware k i stil play my pirated games ?? pls reply thx man
I tried this, but as soon as I run the first program, 3.52 M33 Creator, my screen goes black than turns off. Any help?
Yea me upgrade isnt working, when i go to a game from my mem stick, it goes straight to my umd. any ideas? before i upgraded i had 3.40 oe
Dan I kept running into the same problem and for the life of me couldn’t figure it out. After 4hrs of trial and error i found the solution. Simply format your mem stick and for safe measure restore your default settings. This hopefully gives you a clean slate to work with. Then drop the files as instructed into the game150 folder and you should be set. Hope that helps.
this is the cool update
amazing how you explain the psp upgrading. thanks very much, in sorry for my english but i do my best.
This help me a lot with my psp, I really thank you.
Thank you… It really works…
my psp cant read games…..but it can read themes and MP3’s……what should i do so that i can play games???????????
any suggestions or comments……….
i need your help…………………………..
GRACIAS MUY UTIL. TODO OK.
how to see which version i have
see system settings
After the installation of M33 Upgrade 3.52 it said press x to shut down, i did…
But now, my psp seems to be as dead as a dodo….
i downloaded the file at the beggining and it says the game cannot be started
the data is corrupted
where can i get the extra features after i have downloaded
Thanks
Thank you so much my psp is great