This article was originally published at RJL Marketplace in early 2006.
Some elements of this article may be outdated.
Why Downgrade?
PSP with version 1.5 or lower firmware are able to run homebrews, emulators, and most importantly, load game images of the memory stick without the need of a UMD.
Can I downgrade?
, scroll down to 'System Information' and note the firmware version you are running. What we need
There are 2 different downgrades out there.
I'd personally used the MPH downgrader on my 1.51 PSP and it worked like a charm. It's easy to use and works 100%.
Here are the things we need to have before we start the downgrade process:
- 1.MPH Downgrader
- 2.EBoot Version 1.5
- 3.EBoot Version 2.0 (if your PSP is a version 1.51 or 1.52)
VERY IMPORTANT
Firstly, if your PSP firmware version is a 1.51 or 1.52.
You have to upgrade your PSP to a version 2.0 first before downgrading it.
Also, make sure your PSP is plugged into the AC power source before starting and upgrade process.
To upgrade to 2.0
- 1. Connect your PSP to your computer via a USB connection
- 2. Go to 'My Computer' and explore the Removable Disc that is detected on Windows, which is actually your PSP.
There should be a folder called 'PSP there. - 3. Within the 'PSP' folder, there is a folder called 'GAME'. Within the 'GAME' folder, create a folder called 'UPDATE'.
IMPORTANT: The update folder can ONLY be inside the 'GAME' folder for the update process to work. - 4. Copy the firmware version 2.0 file EBOOT.PBP into the 'UPDATE' folder. (Please make sure it's the right firmware version)
- 5. Disconnect the USB connection.
- 6. To start the update, Select
under 
from the home menu, and select 
. - 7. Press the
button to start the update. - 8. After the update's done, go to your system information under system settings to confirm it.
- 9. You can now delete EBOOT.PBP file from the 'UPDATE' folder.
To downgrade to 1.50
- 1. Connect your PSP to your computer via a USB connection
- 2. Go to 'My Computer' and explore the Removable Disc that is detected on Windows, which is actually your PSP. There should be a folder called 'PSP there.
- 3. Within the 'PSP' folder, there is a folder called 'GAME'. Within the 'GAME' folder, create a folder called 'UPDATE'.
IMPORTANT: The update folder can ONLY be inside the 'GAME' folder for the update process to work. - 4. Copy the firmware version 1.5 file EBOOT.PBP into the 'UPDATE' folder. (Please make sure it's the right firmware version)
- 5. Unpack the MPHDowngrader file
- 6. Copy overflow.tif into the 'PHOTO' folder
- 7. Copy index.dat and h.bin into your root directory (not the 'PSP' folder)
- 8. Disconnect the USB connection
- 9. Select
in your home menu, and scroll to overflow.tif - 10. Don't press any button. The process will run automatically. Two strings of numbers will appear on the screen.
- 11. Wait for 30 seconds or more, and then power-off your PSP by sliding the power button up and holding it till shuts down.
- 12. Turn on your PSP again
- 13. To start the downgrade, Select under from the home menu, and select .
- 14. Press the button to start the process. Just follow the prompts.
- 15. A progress bar will appear when the downgrade is in process.
- 16. When it reaches 99%, the system WILL CRASH AND SHOW AN ERROR. Do not worry as this is a necessary part in the downgrade process.
- 17. Once again, power-off your PSP by sliding the power button up and holding it till shuts down.
- 18. Turn the PSP back on.
- 19. Another error message will pop up. Just ignore it and press the button. The system would then rebuild the system data on its own and restart.
- 20. Almost done! Just go to your system information under system settings to confirm that the firmware version is 1.50.
- 21. You can now delete EBOOT.PBP file from the 'UPDATE' folder.
- 22. Congrats! Your PSP can now run homebrew and many other cool applications!
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