You don't it not for such a complex game
The answer is both no and yes. You do not need custom firmware installed to run UMD games. UMD games are the disc-type games that you buy at the store. You will, however, require a custom firmware installed on the psp to run backups which are copies of the UMD (disc-type) on your memory stick.
No, you cannot. The "emulators" that you find all around the web are called "homebrew applications", small programs designed for third-party functions that the official Sony PSP firmwares don't support. To run homebrews, you must have custom firmware, but that means "degrading" back to FW 1.5 and replacing with the custom.
OE stands for Open Edition, a version of custom firmware that allowed people to run Homebrew applications on the PSP. This has now been superceded by the M33 edition, which is now at 5.00 M33-4 for the latest firmware.
you must first downgrade to 1.50 and then upgrade to custom firmware (m33) then you can run homebrew games in the GAME150 folder and other hombrew items there also.
You don't You just Don't* *unless you have custom firmware, and are ok with abysmal fps... in that case, Google the ROM and run nullDC PSP build.
You just run along and listen to Stephen Fry welcome you to LittleBigPlanet
Hacking the PSP means to overwrite the firmware, ie, the programming that boots the PSP up and tells it how to operate. Custom Firmware allows you to run 'homebrew' software, ie, programs the general public has made for the PSP, as well as tinker with the PSP's internal settings.
By having a custom firmware psp and using a cheat device called cwcheat. It is a program run on a plugin you can download it on this site http://cwcheat.consoleworld.org/
If you are referring to singleplayer, use cwcheat or similar program. This program does require custom firmware to run. If you are referring to multiplayer, don't.
PS3 Exclusively
Then you have to run custom firmware. There's a app for the PSP that's called: Explora Run that on your PSP, and you can delete, copy, open files in all folders on your PSP. Hope this helps
Bassicaly the same; PSP 2000 has Skype and slightly brighter screen