it depends on what version of the psp you have. If you got a phat psp then yes, you would have to downgrade to 1.5 then upgrade from there, if you have the slim then you would have to have someone with custom firmware to make a pandora's battery for you and install the firmware from a magic memory stick. As for updating custom firmware to newer versions, just copy the installer to the \psp\game folder and run it, just make sure you are already using a custom firmware and not the official firmware.