I saw considerable traffic from my 3.80 M33 is released post look for a way to convert from Sony’s official Firmware to the current one so I thought of making a guide for it.

Okay I lied part of the title. I was supposed to start off with a How to on downgrading but so you don’t mess anything up, why don’t you just use the guide I followed. It’ll help you downgrade your PSP (Phat for Slims you need to use this guide) to 1.50 and allow you to install custom firmwares.

IMPORTANT:  IF YOU CHOOSE TO IGNORE THIS WARNING THEN DON’T COMPLAIN THAT YOUR QUESTIONS AREN’T BEING ANSWERED!

This guide is sorely outdated and difficult to follow (not to mention update to something more useable).  Instead of dwelling here, I advise you to read my revamped guide on How to install custom firmware on your PSP guide.  It’ll teach you the ropes on how to upgrade your PSP from any firmware version below 5.00 into custom firmware!

Note 1: Make sure your PSP is charged to at least 78% or is connected via AC adaptor before you decide to change firmwares

Note 2: DO NOT, I repeat, DO NOT reset, turn off, or interrupt your PSP while upgrading/installing firmwares otherwise you’ll end up bricking it.

Note 3: If you have questions post them below. I’ll try my best to help you.

Note 4: The guide was made from a collection of Readme’s from all the mentioned CFW dumbed down so even the most novice of PSP users will understand. If you still miss something, post a question.

On with the Guide:

Installing 3.52 M33 on a downgraded PSP (1.50)

Requirements:

• A PSP on 1.50 Firmware. Downgrade or A PSP with any OE firmware
• PSP battery that’s at least 78% full
• The 3.52 M33 installation file
• A USB cable, to connect your PSP to a PC.

Installation of 3.52 M33 on 1.50 Firmware:

• Extract the 3.52 M33 files to your computer.
• Copy the folders ‘kxploitpatcher and kxploitpatcher%’ to the directory; ‘X:/PSP/GAME/’ on your PSP’s memory stick.
• Copy the folder ‘M33CREATOR’ to the directory; X:/PSP/GAME/ on your PSP’s memory stick.
• Download the official 3.52 update and rename to 352.PBP.
• Copy the 352.PBP to the directory; X:/PSP/GAME/M33CREATOR/ on your PSP’s memory stick.
• Download the official 1.50 update and rename to 150.PBP.
• Copy the 150.PBP to the directory; X:/PSP/GAME150/M33CREATOR/ on your PSP’s memory stick.
• Run ’3.52 M33 CREATOR’ under GAME on your PSP
• Run ’3.52 M33UPDATE’ under GAME on your PSP
• After all process is complete, press X. Your PSP will reboot.
• Congratulations, you’ve just installed 3.52 M33

Installation of 3.52 M33 on OE/M33 Firmware:

• Extract the 3.52 M33 files to your computer.
• Copy the folder ‘M33CREATOR’ to the directory; X:/PSP/GAME150/ on your PSP’s memory stick.
• Download the official 3.52 update and rename to 352.PBP.
• Copy the 352.PBP to the directory; X:/PSP/GAME/M33CREATOR/ on your PSP’s memory stick.
• Download the official 1.50 update and rename to 150.PBP.
• Copy the 150.PBP to the directory; X:/PSP/GAME150/M33CREATOR/ on your PSP’s memory stick.
• Run 3.52 M33 CREATOR under GAME on your PSP
• Run 3.52 M33UPDATE under GAME on your PSP
• After all process is complete, press X. Your PSP will reboot.
• Congratulations, you’ve just installed 3.52 M33

Now in order to switch from 3.52 M33 to 3.71 M33, you need update 4 of 3.52

Installation of 3.52 M33-4 Update on 3.52 M33:

• Download 3.52 M33-4 and extract it to your computer.
• Copy the Update folder to X:/PSP/GAME/ on your PSP’s memory stick.
• Run 3.52 M33-4 UPDATE under GAME on your PSP
• After all process is complete, press X. Your PSP will reboot.
• Congratulations, you’ve just installed 3.52 M33-4

As a precaution, format your Memory Stick or delete all used files before proceeding. After which you can proceed to the next installation.

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