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.

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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