uhm??
First of all there is currently no M33 Firmware for PSP 3000, your brother's PSP must be a 2000
you should have different M33 Firmwares, and the compatibility for PSX games changes between different firmwares.
There is a plugin called popsloader that you can use to load the PSX games with the compatibility from another firmware
You're gonna have to search for it, as I've never used it
hope this helps
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