I'm pretty sure you can't....
They are just putting in new maps to play in, it wouldn't be different if it had the same maps.
Cheat
you mod
The game disc is not writable and you can not add or delete from it
By playing Rise Of The Empire and doing Galactic Conquest! Then on instant action new maps should appear!
There is a modded version of SWB2 PSP , it includes 4 new maps and forces 16 AI on each team on EVERY map . Try googling it .
my anser is to go in that door and get the rifle
AnswerYou need to make sure you have downloaded the latest patch for Star Wars: Battlefront II otherwise it will not recognise the maps.Next, create a folder called "addon" (without quotations). Then, simply dump the folder containing the map (the map's readme usually tells you which folder exactly)True AnswerGo into My computer/local disk/Program Files/Lucasarts/Star Wars Battlefront 2/GameData and then create a new folder and name it addon then put all of the stuff you want to put in there (this might only work for maps).
Well there wasent a battlefront 1 and 2 on the psp so could be something new for it
unlock new classes there are artillary, heavy, engineer, and spy
There is Star Wars Battlefront, Star Wars Battlefront 2, Star Wars Racer Revenge, Star Wars Bounty Hunter, Star Wars Episode 3 Revenge of the Sith, Star Wars Starfighter, Star Wars Knights of the Old Republic, Star Wars Empire at War, Star Wars the Force Unleashed, Lego Star Wars, Lego Star Wars 2 The Original Trilogy, Lego Star Wars The Complete Saga, Star Wars: The Clone Wars Lightsaber Duals, Star Wars: The Clone Wars Republic Heroes, and soon to be released are Star Wars The Old Republic, Star Wars The Force Unleashed 2, and Lego Star Wars 3 The Clone Wars, Star Wars Battlefront ellite squadron, star wars battlefront 3 Wii, star wars battlefront ranegade squadron. that is all I know. new games will be made.
Star wars Battlefront III has not been released and no release date has been given and it is more a myth than an actual game to be released. It is very doubtful that it would be released for the PS2 see related link