Installing Custom Firmware 5.00 M33-3. This article assumes that you have custom firmware (OE/M33) installed on your PSP and want to upgrade to version 5.00 M33-3.
If you have OE/M33 firmware lower than 3.52 M33 please start from Section A.
If you have OE/M33 firmware equal or greater than 3.52 M33 and lower than 3.52 M33-4, please start from Section B.
If you have OE/M33 firmware equal or greater than 3.52 M33-4 and less than 4.01 M33, please start from Section C.
If you have OE/M33 firmware equal or greater than 4.01 M33 and less than 4.01 M33-2, please start from Section D.
If you have OE/M33 firmware equal or greater than 4.01 M33-2 and less than 5.00 M33 please start from Section E.
If you have OE/M33 firmware equal or greater than 5.00 M33 and less than 5.00 M33-3, please start from Section F.
If you have followed the instructions in my previous post Installing PSP custom firmware 5.00 M33, please start from Section F.
Downloads:
(DL.C.1) Custom firmware 3.52 M33
(DL.C.2) Custom firmware 3.52 M33-4
(DL.C.3) Custom firmware 4.01 M33
(DL.C.4) Custom firmware 4.01 M33-2
(DL.C.5) Custom firmware 5.00 M33
(DL.C.6) Custom firmware 5.00 M33-3
(DL.O.1) Official firmware update 1.5
(DL.O.2) Official firmware update 3.52
(DL.O.3) Official firmware update 4.01
(DL.O.4) Official firmware update 5.00
Section A – Install custom firmware 3.52 M33
Files to be downloaded and extracted:
(a) Custom firmware 3.52 M33 (DL.C.1)
(b) Official firmware update 1.5 (DL.O.1)
(c) Official firmware update 3.52 (DL.O.2)
Steps to install:
(A.1) Copy the folder M33CREATOR and its contents to your PSP’s memory sticks’s /PSP/GAME150/ folder (eg. Z:/PSP/GAME150/).
(A.2) Rename Official firmware update 1.5 (EBOOT.PBP) to 150.PBP.
(A.3) Copy the file to your PSP’s memory stick’s /PSP/GAME150/M33CREATOR/ folder (eg. Z:/PSP/GAME150/M33CREATOR/).
(A.4) Rename Official firmware update 3.52 ((EBOOT.PBP) to 352.PBP.
(A.5) Copy the file to your PSP’s memory stick’s /PSP/GAME150/M33CREATOR/ folder (eg. Z:/PSP/GAME150/M33CREATOR/).
(A.6) In your PSP, browse to your Memory Stick and run the program 3.52 M33 CREATOR.
(A.7) After it completes, run the the program 3.52 M33UPDATE.
(A.8) Your PSP is now running custom firmware 3.52 M33. You can now delete the folder M33CREATOR folder from your PSP.
Section B – Update to custom firmware 3.52 M33-4
Files to be downloaded and extracted:
(a) Custom firmware 3.52 M33-4 (DL.C.2)
Steps to upgrade:
(B.1) Copy the folder M33Update4 and its contents to your PSP’s memory sticks’s /PSP/GAME150/ folder (eg. Z:/PSP/GAME150/).
(B.2) In your PSP, browse to your Memory Stick and run the update (the icon has a grey background, with red letters saying 3:33:33 in the foreground).
(B.3) Your PSP is now running custom firmware 3.52 M33-4. You can now delete the folder M33Update4 folder from your PSP.
Section C – Install custom firmware 4.01 M33
Files to be downloaded and extracted:
(a) Custom firmware 4.01 M33 (DL.C.3)
(b) Official firmware update 4.01 (DL.O.3)
Steps to install:
(C.1) Copy the folder UPDATE and its contents to your PSP’s memory sticks’s /PSP/GAME/ folder (eg. Z:/PSP/GAME/).
(C.2) Rename Official firmware update 4.01 (EBOOT.PBP) to 401.PBP.
(C.3) Copy the file to your PSP’s memory stick’s /PSP/GAME/UPDATE folder (eg. Z:/PSP/GAME/UPDATE/).
(C.4) Go to Recovery mode (Power off your PSP by holding the power button for 10 seconds. Turn on your PSP while holding the right shoulder button to go into recovery mode). Revert your kernel to 3.52 (or any kernel above 3.52 like 3.90). Exit the Recovery mode.
(C.5) In your PSP, browse to your Memory Stick and run the program 4.01 M33.
(C.6) Your PSP is now running custom firmware 4.01 M33. You can now delete the folder UPDATE folder from your PSP.
Section D – Update to custom firmware 4.01 M33-2
Files to be downloaded and extracted:
(a) Custom firmware 4.01 M33-2 (DL.C.4)
Steps to upgrade:
(D.1) Copy the folder UPDATE and its contents to your PSP’s memory sticks’s /PSP/GAME/ folder (eg. Z:/PSP/GAME/).
(D.2) In your PSP, browse to your Memory Stick and run the program M33-2.
(D.3) Your PSP is now running custom firmware 4.01 M33-2. You can now delete the folder UPDATE folder from your PSP.
Section E – Install custom firmware 5.00 M33
Files to be downloaded and extracted:
(a) Custom firmware 5.00 M33 (DL.C.5)
(b) Official firmware update 5.00 (DL.O.4)
Steps to install:
(E.1) Copy the folder UPDATE and its contents to your PSP’s memory sticks’s /PSP/GAME/ folder (eg. Z:/PSP/GAME/).
(E.2) Rename Official firmware update 5.00 (EBOOT.PBP) to 500.PBP.
(E.3) Copy the file to your PSP’s memory stick’s /PSP/GAME/UPDATE folder (eg. Z:/PSP/GAME/UPDATE/).
(E.4) Go to Recovery mode (Power off your PSP by holding the power button for 10 seconds. Turn on your PSP while holding the right shoulder button to go into recovery mode). Revert your kernel to 4.01. Exit the Recovery mode.
(E.5) In your PSP, browse to your Memory Stick and run the program 5.00 M33.
(E.6) Your PSP is now running custom firmware 5.00 M33. You can now delete the folder UPDATE folder from your PSP.
Section F – Update to custom firmware 5.00 M33-3
Files to be downloaded and extracted:
(a) Custom firmware 5.00 M33-3 (DL.C.6)
Steps to upgrade:
(F.1) Copy the folder UPDATE and its contents to your PSP’s memory sticks’s /PSP/GAME/ folder (eg. Z:/PSP/GAME/).
(F.2) In your PSP, browse to your Memory Stick and run the program M33-3.
(F.3) Your PSP is now running custom firmware 5.00 M33-3. You can now delete the folder UPDATE folder from your PSP.
Posted on 22:38, October 25th, 2008 by 
Posted in 
Hi.
When I’ve instaled the 4.01 custom firmware from that link and now I can´t see any ISO or update my PSP…
Could you know how this is happening?
reply to my email please.
thanks for attention
Hi there, did you install 4.01 M33 as described in Section C? What do you mean you can’t see any ISO? Do you mean you can’t see the ISO folder in your memory stick?
Hi,
Thanks so much for your guide so easy to follow. Definitly the best! I’m a complete noob and upgraded from 1.5 of to 5.00M33-3 easily. thanks again!
Glad that the guide helped you David. Have fun with your PSP!
Wow! Your guide is really easy to understand and follow. It gave me the confidence to update the firmware myself. Thanks for your help.
Congratulations on your new found confidence PcPhobic! Glad that you found the guide helpful.
hey thanks youre great many stupid guide froze my psp and dis is da one that only work thnks for the guide
totally ur update rocks
i can now use the backround for xmb m33-3
thnks
Glad it works for you, carlivor.
Hi! my current version was 5.00m33. then i downloaded the latest version 5.50. and now my theme file CTF is not working. and i cannot see my games anymore. Then i downloaded 5.00m33 to bring back the CTF files themes.. but its not working..
Hi there. Do you mean you updated your PSP to the OFW version 5.50? Did you manage to revert to CFW 5.00m33?
thank you very much
I found your blog on google and read a few of your other posts. I just added you to my Google News Reader. Keep up the good work. Look forward to reading more from you in the future.
Hi, same thing happened to me just like gamer19 i have a previously working 3.71 m33 then i accidentally downloaded ang installe a 5.50 version which is not from m33. ISO folder is now gone and only umd games are playable. What should i do with this?Please help. Thanks.
Hi Ace, once your PSP is updated with the current OFW, the only way to install a CFW that I know of is to use a Pandora’s battery.
Hey i havethe custom firmware of 3.71 M33-3 according to the system information menu on the psp
according to this guide i need to follow sections C, D, E, and F. is that correct?
Fire, just you should start from Section C onwards.
handy guide worked fine for me thanks for the links and the walkthrough, very handy.
Thanks dude your guide is the best!!!!
Hi, thanks for the guide! I have a question though, I’ve followed up to section D, but when I try to install the 5.00 m33, I get the message “incorrect file”. Any help in resolving this would be appreciated. Thanks!
Hi yunalesca, that error most likely means that there is a problem with the original firmware update 5.00 that you are using. Can you please re-download all the custom and original firmware for Section E again and make sure that the original firmware (DL.O.4) is renamed exactly as “500.PBP” (without the quotes) before trying to upgrade.