Canon copier firmware or harddisk software?
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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.
This would depend on what firmware you wished to update. Most firmware is only covered by their manufacturers official website and using other firmware would invalidate your warranty.
The newest known firmware for the PSP is 5.54
Type *#0000# to show firmware version.
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.