M33 Custom Firmwares

What's a Custom Firmware?

Custom firmware replaces your PSPs official firmware but it is not a permanent upgrade.
You can easily uninstall the custom firmware and to back to official firmware if you
don't like or don't want to use custom firmware anymore.

Custom Firmware has all the features of the official Sony firmware, but also adds the ability
to load homebrew PSP ISOs and PSX EBOOTs directly from the game menu in the XMB.
so you can still play your original UMD disc, music and videos using custom firmware.

Custom Firmware also has an option to use 'No-UMD Mode' so you can run your PSP ISOs without a UMD inserted.

How to Install M33 Custom Firmwares?

1. Download the 'M33 Custom Firmware' Installer.
2. In recovery mode, make sure the 'Kernel Mode' is set to 3.xx Kernel
Hold 'R', Turn on PSP -> Configuration -> Game Folder Homebrew -> 3.xx Kernel
(note: this could be 2.xx, 3.xx, 4.xx or 5.xx Kernel, it depends on your current custom firmware version)
3. Connect your PSP to your computer and create a USB Connection.
4. Extract the Custom Firmware Installer to a folder on your computer.
5. Copy the UPDATE folder into the PSP \ GAME folder.
6. Close the USB connection and disconnect the USB cable.
7. Go to the game-> Memory Stick Menu and run the 'PSP Update ver 5.00' program.
7. Press X and the Sony updater will begin and write the official firmware files. (The custom firmware files will be written in the next step.)
The 'Sony updater' screen is normal, go through the firmware update process like you would install an official update.
8. When finished, the updater will ask you to reboot, Press the X (or O) button.
This will finish installing the 'Custom Firmware' files to your PSP.
9. You have now installed the Custom Firmware update onto your PSP.
You can check the firmware version using the 'Settings -> System Settings -> System Information' menu.
10. Go to the Game -> Memory stick menu, highlight the 'PSP Update ver x.xx' icon.
Press Triangle, choose 'Delete', select 'Yes' and press 'X' to delete the installer from your memory stick.

NOTE: The folowing downloads on this post are uploaded by another person/group. This blog and it's moderator/s is/are NOT responsible for uploading these files. Download links were only provided. Also, the moderator/s of this blog and/or the uploader of the files are NOT responsible for anything that may happen but these files were tested working. Please make sure that you already knew the installation processes of these stuffs.
Any broken download link means that either the uploader or the website already deleted/moved/renamed the file.

3.51 M33

• 3.51 M33-1
• 3.51 M33-2
• 3.51 M33-3
• 3.51 M33-4
• 3.51 M33-5
• 3.51 M33-6
• 3.51 M33-7

3.52 M33

• 3.52 M33-1
• 3.52 M33-2
• 3.52 M33-3
• 3.52 M33-4

3.71 M33

• 3.71 M33-1
• 3.71 M33-2
• 3.71 M33-3
• 3.71 M33-4

3.80 M33

• 3.80 M33-1
• 3.80 M33-2
• 3.80 M33-3
• 3.80 M33-4
• 3.80 M33-5

3.90 M33

• 3.90 M33-1
• 3.90 M33-2
• 3.90 M33-3

4.01 M33

• 4.01 M33-1
• 4.01 M33-2

5.00 M33

• 5.00 M33-1
• 5.00 M33-2
• 5.00 M33-3
• 5.00 M33-4
• 5.00 M33-5
• 5.00 M33-6

5.50 M33

• 5.50 M33 Gen-A
• 5.50 M33 Gen-B