The newest known firmware for the PSP is 5.54
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Yes, you can The firmware goes across board to all models of PSP. This includes the Customer Firmware and the Original Firmware.
Right now there isn't. If you want to get custom firmware for psp version 6.20 you need to downgrade to custom firmware using a Pandora battery.
get a custom firmware ya hackeer
The thing that powers the PSP. It also enables you put put Custom FirmWare on the PSP
From what I hear one must have a Pandora battery and a magic memory stick. These devices can only be made on a psp with custom firmware, or a psp with version 1.5.