How to downgrade, install CFW on ANY PSP using Universal Pandora Memory Stick (UPMS):
Intro:
Okay folks, this is an updated UPMS tutorial for those of you on 3.80 M33 and greater. 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), even a fake eBay MS.
- If on 3.80 M33+, please have no custom theme installed/prx's installed in flash0 as 400K of free space is required to install IPL patch. When UPMS is finished running, this flash0 mod will be deleted.
Fake MS Steps:
1. Download the UPMS V3 from UPMS webpage at
UPMS Project Website.
2. Extract the CSO file from the rar package and place in the ISO folder of your PSPs Memory Stick (MS).
3. Then run the CSO called "UPMS Installer" from your PSP by browsing to GAME / Memory Stick in XMB.
4. Run the "Format Fake Memory Stick program in the UPMS Main Menu".
5. Remove and Insert your fake Memory Stick, then press X to create folders and exit UPMS program.
What to do: PSP CFW > 3.80 M33
1. Download the UPMS V3 from UPMS webpage at
UPMS Project Website
2. Extract the CSO file from the rar 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
Sony 3.80FW and rename them to 150.PBP and 371.PBP and 380.PBP.
4. Then run the CSO called "UPMS Installer" from your PSP by browsing to GAME / Memory Stick in XMB.
5. UPMS warning screen will appear "In order to Install the IPL to MS when using 3.80 M33+, we must write to flash...." Press X and wait for UPMS to exit to XMB.
6. Place the 150, 371.PBP and 380.PBP in root/base level of the MS.
7. Run the UPMS installer again from GAME/ Memory Stick in XMB.
8. A menu will appear with 4 steps, we want to complete the first 3.
9. Select Step 1 (IPL Tools) and install the "Sleep Fix Multi-IPL to Memory Stick", then back to Main Menu.
10. Select Step 2 (Battery Tools) and choose "Create Pandora Battery (Service Mode)", then back to Main Menu.
11. 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.
12. When thats finished you can go back to the Main Menu and exit the Installer. Turn off your PSP and remove the MS and Battery from CFW PSP.
What to do: PSP CFW < 3.80 M33
1. Download the UPMS V3 from UPMS webpage at
UPMS Project Website
2. Extract the CSO file from the rar 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
Sony 3.80FW and rename them to 150.PBP and 371.PBP and 380.PBP.
4. Place the 150, 371.PBP and 380.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. Turn off your PSP and 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. Keep L-Trigger pressed. PSP will boot up (no display), then shut down.
6. Remove battery and move PSP power switch to normal position.
7. Hold down L-Trigger and insert Pandora Battery.
8. When MS access light starts flashing orange, release L-Trigger
9. UPMS Cuatro Menu should appear giving the option to use DC V3 for 3.71 M33-2 or DC V4 for 3.80 M33-5.
10. Make your choice of which FW to install. 3.71 M33 is stable, bug free, works with all released UMD games, 3.80, 3.90 M33 is brand new, has a few issues but has auto-update feature.
11. 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.
12. Repeat steps 6-8 and you will be presented with UPMS Cuatro Menu again.
13. Press X this time to install your CFW of choice.
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 Cuatro Menu should appear giving the option to use DC V3 for 3.71 M33-2 or DC V4 for 3.80 M33-5.
5. Make your choice of which FW to install. 3.71 M33 is stable, bug free, works with all released UMD games, 3.80, 3.90 M33 is brand new, has a few issues but has auto-update feature.
6. Backup NAND with square [ ] and it will write NAND to your MS, you will need 32MB of free space for this. When this is finished your PSP will power off.
7. Repeat steps 2-4 and you will be presented with UPMS Cuatro Menu again.
8. Press X this time to install your CFW of choice.
Save nanddump.bin in root of MS to your PC when you are finished for safe keeping, incase you brick your PSP one day.[/QUOTE]
Multi-Booting PSP with IPL loader:
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. This feature works on all
Phat PSPs with any CFW but only on the Slim PSP using CFW 3.90 M33-2.
If you have more than one MS, run the UPMS installer again from that MS and only install "Sleep Fix Multi-IPL to Memory Stick".
This will enable you to keep your battery in Service Mode at all times even when switching your MS around.
Thanks:
Big thanks to No45 for volunteering his services in testing this tutorial on his CFW PSP Slim and sending me back his valuable feedback including taking and hosting pics.
Thanks also to the ever present Mejilan and Faceless Master.