put it in GAME folder
Yes, you can The firmware goes across board to all models of PSP. This includes the Customer Firmware and the Original Firmware.
The thing that powers the PSP. It also enables you put put Custom FirmWare on the PSP
No.
No, you can't.
plug your psp into your PC but don't use manager put the firmware into the iso folder
it depends on your psp. for example i am using PSP-2000 which i use firmware 4.01 and for my PSP-3000 i am using firmware 5.03.
most of the time
The newest known firmware for the PSP is 5.54
There's a chance it will break it, it allows you to downgrade your firmware so you can put on custom firmware, this is ILLEGAL. Also, if you do it wrong it would destroy your psp
I'm not sure what you mean by "the mod" but I think you may be referring to a "custom firmware". If so, you can safely format your PSP's memory stick without removing the custom firmware. This is because the custom firmware is stored in the internal PSP flash memory, not on your memory stick. If you want to remove the custom firmware, you will need to just install an official firmware onto the psp. The easiest way to do this is to put in a PSP game that comes with a firmware upgrade and choose that option. Then I would recommend having the psp do a Network Update.
No only if you put cfw (custom firmware) on it by hacking.
You can update your firmware using wifi in the settings at the top, or better than that you could mod your psp and install ultimate psp tube.