So, are you looking for an older version of PSP 3.03? Well, this article can help you.
First of all, you need an unpatched copy of Grand Theft Auto Liberty City Stories.
There is no other way to downgrade any PSP above 2.81 without it. Now for some reason people don’t seem to appreciate this fact and will spend hours and hours searching the internet for other ways to downgrade without the GTA. Let me save you time, there is no other way to downgrade any PSP above 2.81 without unpatched GTA.
In late 2005 a vulnerability was found in the way the PSP version of GTA: Liberty City Stories processes save games. In December 2005, software was developed to run unsigned code on PSPs running firmware 2.00 through 2.60. In April 2006, firmware 2.70 was released and the exploit was patched; however, as of January 25, 2007 it was discovered that Sony did not fully patch the exploit, and unsigned code can run on firmware 3.03, a 3.03 downgrader was released 3 days later. exploit was found. Additionally, new copies of GTA: Liberty City Stories also fixed the exploit, preventing it from running on other firmware versions. Since then, homebrew has advanced to the point where a copy of GTA: Liberty City Stories is no longer required to run unsigned code, except on firmware versions 2.81 to 3.03. Sony has now definitively blocked the GTA exploit with the release of firmware update 3.10 and further subsequent firmware updates.
So how do I know if I have the correct GTA for a PSP older than 3.03? Well, it’s actually quite simple. Get your copy of GTA Liberty City Stories and put it on your UMD drive, now navigate to the game folder and you will see the option “UMD Update”. Now if it says “Update 2.00” then you have an unpatched version, if it says “Update 2.60” then you have the patched version which is no good for an older PSP version 3.03.
Now all you have to do from here is find the 3.03 downgrader, there are a couple of versions on the internet that you can download and they are relatively easy to follow. Just make sure you download the software from a reputable place, as there are some bastards who have put fake downgraders on the internet for unsuspecting people to download and crash their PSPs.
Also, make sure you follow the steps exactly as described, this is very important. If you do something out of place, or put a file in the wrong place, you could effectively crash your PSP, so it’s vitally important that you follow the instructions when downgrading from PSP to 3.03.