XiaoFeiChong's Custom Firmware 5.02
If you want to upgrade, you must downgrade first. Any custom firmware upgrade cannot take place unless your PSP is firmware 1.5 or lower.
Chances are that you have a different firmware. If you want to get a custom firmware and downgrade, it is a very complex process that I do NOT recommend if you do not know what you are doing. It is very easy to ruin your PSP during the process. If you are still interested, research "Pandora's Battery" and other downgraders. It is a very long process too long to be explained here, and there are many guides online.
If you miraculously have a PSP that is firmware 1.5, I recommend getting firmware 5.00 m33-4 instead, as it is much more stable. Don't attempt anything unless you understand the consequences of possibly ruining your PSP.
Sorry if I scared you...
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