This guide will show you how to downgrade your PSP firmware.
Please Read: these steps flashes your psp, meaning that there is a small chance of rendering your PSP absolutely useless, by reading this you accept that you cannot hold me, Emuparadise or the people that created this software responsible for what happens to your PSP
The FaQ at the bottom will answer your questions
The files needed are included in this thread.
What's needed
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GTA:- Liberty City Stories (Unpatched Version)
[Noobz 3.03 Homebrew Enabler (HEN)] Download:http://dl.qj.net/Homebrew-Enabler-%2...2430/catid/114
[Noobz 3.03 to 1.50 downgrader] Download:
http://dl.qj.net/Downgrader-for-v3.0...2431/catid/114
[1.50 Update] Download:
http://dl.qj.net/PSP-Firmware-1.50-F.../163/catid/163
Steps
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1. Update to firmware 3.03. If you already have this firmware then proceed to step 2.
2. Open the 3.03 downgrade file and copy the contents of the folder MS_ROOT to the root of your memory stick.
3. Open the 1.5 update and rename the EBOOT.PBP to UPDATE.PBP then copy it to /PSP/GAME/UPDATE/
Make sure not to overwrite PSP/GAME/UPDATE/EBOOT.PBP
4. Load Grand Theft Auto: Liberty City Stories (unpatched)
5. It should get to loading save game, clear the screen, the screen should fill with a light blue color and then reset the PSP
6. Check that HEN is running by going to system settings then System Information and it should show up as system version 303 HEN
7. If it is showing up as 3.03 HEN then go to the memory stick and run the x.yz update
8. Before the downgrader does anything to your PSP it will ask for you to agree to what it is doing
If you no longer want to continue press the Right Shoulder Button (R-TRIGGER).
9. Once you have agreed to start the downgrade do not unplug the PSP
10. Once finished the PSP will ask you to press X, after pressing it will reset it self.
11. If it comes up saying that the settings are corrupt press X to continue.
12. Enjoy your new golden firmware
FaQ
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Q. How can I tell if i have an unpatched version of GTA: LCS or not?
A.Unpatched versions of Liberty City Stories contain the 2.0 update, whereas patched versions contain higher updates.
Q. How can I tell the HEN enabler has worked?
A. Go to system settings on the XMB, then go to system information, it should say;
System software 3.03 HEN,
If it doesn't run the HEN enabler again.
Q. Why would I want to be on lower firmware?
A. Lower firmware security allows unsigned code to run on your psp (Homebrew), such as; games, applications and other great software.
Q. I have already upgraded to a higher firmware than 3.03, can i still downgrade
A. Not with this downgrade, check QJ.net for other downgrades.
Now I have Downgraded, what next?
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You can either go to QJ.net and start downloading Homebrew, or you can upgrade to Dark_AleX's 3.10 OEA custom Firmware.
Q. Why would I want to upgrade when I'm already on firmware 1.50?
A. With Dark_AleX 3.10 OEA you can enjoy the freedom of 1.50 homebrew capabilities, and also play psp games that need a higher firmware to run.