What does the Pandoras battery do

The Pandora's Battery (PSP) is basically a hacked psp battery. when you put it into the psp it allows you to enter service mode. a feature which is used by sony and game developers to see if the games the have created work without buring it onto a UMD. it can also allow you to get CFW (Custom FirmWare) which is like OFW (Official FirmWare) but you can play backed psp games from your memory stick and run homebrew applications (Stuff made by psp users).