************* THIS GUIDE WILL NOT WORK ON 3.80, 3.90 M33 FIRMWARE DUE TO CHANGES IN IPL IN SONY 3.80 & 3.90 FIRMWARE ********************
How to downgrade, install CFW on ANY PSP using Universal Pandora Memory Stick (UPMS):
Intro
Okay folks, this is my first tutorial here. I've decided to write this tutorial as the question how do I install CFW on my new PSP Slim is appearing more and more on these forums. The old downgraders that we used to use on the old phat PSP don't work with the new Slim or any phat PSP with firmware greater than 3.50. As you may know or have heard Dark_Alex and Team C+D came with the Pandora Battery and in this tutorial we are going to make a Pandora Battery setup developed by BRONZ3gh0st and OverfiendX called UPMS. So lets begin,
What you'll need:
- Any PSP with CFW installed, it doesn't matter if its a phat or slim PSP.
- Memory Stick Pro Duo ranging in size from 256MB (minimum) to 4GB (maximum)
What to do:
1. Download the UPMS package from UPMS webpage at
UPMS Project Website
2. Extract the CSO file from the zip package and place in the ISO folder of your PSPs Memory Stick (MS)
3. We then need to download the
Sony 1.5FW and
Sony 3.71FW and rename them to 150.PBP and 371.PBP.
4. Place the 150, 371.PBP in root/base level of the MS.
5. Then run the CSO called "UPMS Installer" from your PSP by browsing to GAME / Memory Stick in XMB.
6. A menu will appear with 4 steps, we want to complete the first 3.
7. Select Step 1 (IPL Tools) and install the "Sleep Fix Multi-IPL to Memory Stick", then back to Main Menu.
8. Select Step 2 (Battery Tools) and choose "Create Pandora Battery (Service Mode)", then back to Main Menu.
9. Select Step 3 (Firmware Tools) and choose "Install U.P.M.S with Utilities (Slowest)". It will take a few minutes to install and lots of scrolling text will appear on the PSP screen.
10. When thats finished you can go back to the Main Menu and exit the Installer. Remove the MS and Battery from CFW PSP.
How to use:
For Slim: (MS and Battery removed)
1. Turn off PSP and insert Pandora MS.
2. Slide PSP power switch to Hold Position with yellow dot showing.
3. Hold down L-Trigger.
4. Insert Pandora Battery.
5. When MS light starts flashing orange, release L-Trigger.
6. Despertar Cementerio V3 should load up giving option to flash to 3.71 M33, flash to Sony 3.71FW or backup NAND.
7. Move PSP power switch to regular position.
8. Backup NAND with square [ ] and it will write NAND to your MS, you will need 64MB of free space for this. When this is finished your PSP will power off.
9. Repeat steps 2-7 and you will be presented with Despertar Cementerio V3 menu again.
10. Press X to flash PSP with 3.71 M33.
Save nanddump.bin in root of MS to your PC when you are finished for safe keeping, incase you brick your PSP one day.
For PhatMS and Battery removed)
1.Turn off PSP and insert Pandora MS.
2.Hold down L-Trigger.
3.Insert Pandora Battery.
4.UPMS Main Menu should then choose 3rd Menu Option, Despertar Cementerio V3.
5.DC V3 should load up giving option to flash to 3.71 M33, flash Sony 3.71FW or backup NAND.
6.Backup NAND with square [ ] and it will write NAND to your MS, you will need 32MB of free space for this. Your PSP will power off after this.
7.Repeat steps 2-5 and press X to flash PSP with 3.71 M33
Save nanddump.bin in root of MS to your PC when you are finished for safe keeping, incase you brick your PSP one day.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
This UPMS package has one great feature in that if you don't hold down L-Trigger when you insert Pandora Battery it will boot your PSP as per normal. The MS will act as normal, you can put all your ISOs, emulators on it and play them fine. In the event you brick your PSP, you can repeat the steps in "How to Use" and re-flash your PSP.
Updating 3.71 M33 firmware:
At the time of writing this tutorial, 3.71 M33-4 has just been released and includes some important fixes for your CFW PSP.
1. Download the M33-4 update from
Dark_Alex website.
2. Extract the contents and you should have a folder called UPDATE.
3. Connect PSP to PC using USB and copy the UPDATE folder to ms0:/PSP/GAME.
4. Browse to GAME / Memory Stick in XMB and run the M33-4 updater.
Installing POPSloader for 3.71 M33:
1. Download the POPS archive that Mejidan
uploaded and extract the contents.
2. Copy the SEPLUGINS folder to root of your Memory Stick (ms0
3. Download the multi-disc pops fix
from here.
4. Copy the SEPLUGINS folder to root of your MS, overwriting the files when prompted.
5. Bring up M33 VSH MENU by pressing SELECT.
6. Hold down R-Trigger and select RESET DEVICE.
7. M33 Recovery Menu will appear, scroll down to Plugins and enable popsloader.prx [POPS].
8. Select BACK and then EXIT to reboot PSP.
Installing 1.5FW (homebrew) addon:
WARNING: THIS IS FOR PHAT PSP ONLY, DO NOT RUN ON SLIM
1. Download the 1.5FW V2 addon from
Dark_Alex website.
2. Extract the contents and you should see an UPDATE folder.
3. Connect PSP to PC using USB and copy the UPDATE folder to ms0:/PSP/GAME.
4. Copy the Sony 1.5FW called 150.PBP that we used to make UPMS to root of MS (ms0
5. Browse to GAME / Memory Stick in XMB and run the 1.50 V2 installer
Remote play fix for PSP with PS3 FW 2.10:
http://www.sendspace.com/file/rrybif
1. Open recovery menu on PSP (Reset PSP with R-Trigger held down)
2. Connect USB cable from PC to PSP
3. Go to Advanced
4. Select Toggle USB (flash0). A new window should pop up on your PC. Make sure you have "show hidden files and folders" selected and untick "hide protected operating system files" also in tools/folder options.
5. Replace premo_plugin.prx (vsh\module) and premo_plugin.rco (vsh\resource) with the ones you have in the download link.
6. Select Toggle USB (flash0) to disable
7. Restart PSP