PLEASE NOTE: PSP Bricking is very rare, but can still happen during a Downgrade/ Upgrade. Downgrading/ Upgrading will VOID the Warranty of your PSP. Do this at your own risk.

If you have a PSP and want more from it, then CFW (Custom Firmware) is the way to go. Custom Firmware allows Homebrew applications to be run. SoF (Sony Original Firmware) v1.50 allowed Homebrew applications to be run and gave the PSP a massive appeal. Newer versions of SoF restrict the use of any and all Homebrew applications.

Installing Custom Firmware:
v1.50 to CFW 3.52 M33-4
Requirements:
- v1.50 on your PSP
- Memory Card
- Any UMD Disk
- v1.50 SoF: here
- v3.52 SoF: here
- v3.52 M33 CFW: here
- v3.52 M33-4 CFW Update: here

You will need to download SoF v1.50 and v3.52 and of course v3.52 M33 CFW and v3.52 M33-4 CFW Update from the links above.

Connect your PSP via USB to your computer and extract the contents of “3.52M33.rar” to your “PSP\GAME” folder on your Memory Card:
- PSP\GAME\3.52M33\EBOOT.PBP
- PSP\GAME\kxploitpatcher\EBOOT.PBP
- PSP\GAME\kxploitpatcher%\EBOOT.PBP

Rename SoF v1.50 to 150.PBP and SoF v3.52 to 352.PBP and place them onto your Memory Card under “PSP\GAME\3.52M33\”:
- PSP\GAME\3.52M33\150.PBP
- PSP\GAME\3.52M33\352.PBP

Exit USB Mode and navigate on your PSP to “Game->Memory Stick” ignore any “Corrupted Data” files. Place the UMD Disk into the drive, wait for it to load and run “KXploit Permanent Patcher”. It will prompt you to press X and patch your PSP then return to the XMB (main screen).
Go back to “Game->Memory Stick” and run “3.52 M33 CREATOR”. It will Load the v1.50 SoF and extract it, then Load the v3.52 SoF and extract it. Once completed press X to exit.
Go back to “Game->Memory Stick” and you will see “3.52 M33UPDATE”. Run it and when prompted press X. It will run through a few checks to make sure everything is in order and then format and write files to your PSP’s flash.
Once completed it will prompt your to press X to shut down your PSP. After it has turned off eject your UMD Disk to avoid Auto-Start and power your PSP back up.

Welcome to 3.52 M33 CFW!

Enter USB mode again. You can delete any files you copied/were created for/by this setup.
Create a new folder in “PSP” called “GAME150″:
- PSP\GAME150\

Extract “3.52M33-4.rar” to your “PSP\GAME150″ folder:
- PSP\GAME150\3.52M33-4\EBOOT.PBP

Exit USB Mode and navigate on your PSP to “Game->Memory Stick”. Place your UMD Disk back in the Drive and run the file with the grey icon with “3:33:33″ on it. This is the 3.52 M33-4 Update.
If it gives the error: “The game could not be started.” try moving the folder “3.52M33-4″ to “PSP\GAME\”
When prompted press X. It will update and ask you to press X to shutdown your PSP. Once completed it will prompt your to press X to shut down your PSP. After it has turned off eject your UMD Disk to avoid Auto-Start and power your PSP back up.

Welcome to 3.52 M33-4 CFW!

Tags: custom, firmware, Hacks, playstation, portable, PSP, Sony