flash the bios
firmware chip
Boot ROM.
The best place where you can find cell phone upgrades for your cell phone including Samsung is at your local cell phone technician. Alternatively, you can try the Phone Firmware update which can keep you Samsung mobile up-to-date.
Hacking the firmware depends on the PSP's motherboard, not the current firmware installed. If you're asking whether or not it can be made into a custom firmware, then the answer is yes, but all homebrew would have to be rewritten for it.
It is called Firmware and it holds the basic software needed on the motherboard.
No, the firmware can't be downgraded, nor is there any reason to. Firmware upgrades add to system stability and sometimes add new features.
Check the HCL
It's not the firmware that matters, it's the motherboard. A hackable motherboard can have custom firmware installed no matter what version of the official firmware it uses. 'Unhackable' (at present) ones can't have custom firmware installed at all right now. All phat PSPs can be hacked, most slims can, but recent ones can't, and at present, PSP-3000's can't at all.
There are some firmware upgrades for cameras, but you usually have to send the camera back to the manufacturer, unless it's a pro or semi-pro camera.
Confirm that the BIOS firmware support the dual core CPU
No, a processor is not fixed to the motherboard. Most modern processors are designed to be easily removable and replaceable using a socket on the motherboard. This allows for easy upgrades or replacements without replacing the entire motherboard.
Programs stored on ROM chips are called firmware. The motherboard stores the keyboard controller support program on the ROM chip.