*Warning: Please follow the instructions properly. Do these at your own risk.
This is a step-by-step guide to upgrading your PSP Custom Firmware. I hope this tutorial will help you safely upgrade your PSP to the latest CFW.
However, remember that there is a risk involved that you might brick your PSP and render it useless. Just make sure you fulfill all the requirements.
I was using a Slim Sony PSP ver 3.80 M33-5. I’m not sure if the instructions are the same for the Fat Sony PSP.
Requirements:
- Custom Firmware (CFW) 3.80 M33-x. (Please do not attempt this on official Sony firmwares. Older CFWs will also not work) You need at least CFW 3.80M33-x by Dark-Alex.
- Wireless network (Wifi). Make sure your PSP Wifi connection is setup properly. You need to connect to the internet to retrieve the latest update files.
- More than 80% battery
- At least 30MB memory stick space. The update already takes up 25MB space.
- You also have to enable the network update of the M33 Custom firmware or you will end up updating to the official Sony firmware.
To check if CFW M33 Network Update is enabled, go to recovery mode:
- Shutdown your PSP. Make sure it is not in sleep mode.
- Turn on your PSP while holding the R button.
- When recovery mode appears, go to Configuration
- Make sure this is what appears, Use M33 Network Update (Currently Enabled)
Let’s proceed:
- Go to Settings
- Select Network Update
- Select your Wifi connection. You will see the following:
Connecting to the access point
Exchanging Key Information (This might appear depending on your Wifi network setup)
Obtaining IP Address - It will check if there is a firmware update available. If there is, you will see:
Network Update has found a later
version.
To download, insert a Memory Stick
with at least 1 MB free space and press
the X button. - Press the X button to download.
- It will download the initial update. After that, you will see:
Download completed.
The update is now available in your
Memory Stick.
To install now, press the X button
To install later, go to [Game] - Press the X button to install.
- This will appear next:
Unpacking… done
390.PBP doesn’t exist.
Do you want to download it from the internet? (x=yes, R=no) - Press the X button to download.
- It will again show you the network connection screen, choose your Wifi connection.
- You will see the following:
Connecting to the access point
Exchanging Key Information (This might appear depending on your Wifi network setup)
Obtaining IP Address - Next you will see:
File Size: 25654469 bytes (24 MB)
Downloading… 0% - After reaching 100%, you will see:
File Size: 25654469 bytes (24 MB)
Downloading… 100%
File Saved (size = 25654469 bytes).
Returning to M33 updater… - Then you will see:
Unpacking… done.
Please wait… - Next you will see:
Verifying 390.PBP… ok
Verifying u235.prx… ok
Press X to start the update, R to exit - Press the X button to continue the update
- You will then see:
Verifying 390.PBP… ok
Verifying u235.prx… ok
Press X to start the update, R to exit
Starting the updater. Wait… - The PSP Update ver 3.90 screen will appear next, press X to continue.
- Follow the onsreen prompts, select Accept and keep on pressing the Right Button of the D-Pad until you see the option to press the X button
- Press the X button to continue the upgrade
- Next you will see:
Installing…
Do not turn off the power, disconnect
the AC adaptor or remove the
Memory Stick
0% - Once it reaches 100%, you will see this:
Update completed
Press the X button to restart.
You can now delete the update data
from your Memory Stick. - Press the X button
- After your PSP restarts, go to Settings
- Select System Settings
- Select System Information
- You should see something like this:
System Software 3.90 M33-3
Nickname
MAC Address
Congratulations! You have updated your PSP online!
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Can You post instructions on how to change the Orig. Firmware to a M33 firmware?
:clap_tb:thank dude if i did not find this then
but now am 
instead of 
is this for the latest slim psp 2003s?
Use M33 Network Update (Currently Enabled)
I can’t find this option.
Hi Jidi,
You need to have an M33 CFW by Dark_Alex. This option is specifically for the M33.