help me out man! ABOUT GUNDAM BATTLE UNIVERSE

it is impossible for u to have the gbu cso file with only 129mb
mine is iso (about 750mb)and even i compress to cso,i still get a file nearly 600mb
your file should be a corrupted one, download another

and are you using the hacked psp version? (for example,m-33)
mine is 4.01 m-33
if you are using the official psp version,you are unable to play any games in cso/iso files.(don't ask me how to update the psp into a hacked one,you should be able to find the answer in any forum in Hong Kong......)

you can still play this game with version 3.90 m-33,but if you have a save of the old game------Gundam Battle Chronicle, you will be unable to use the save(i.e. lost all pilot data and ms tunning data,i have tried it before......)

if your psp is already a hacked one,put your iso/cso into your memory stick in this directory:
X(your memory stick):\ISO
that means just open your memory stick and open a new file,named ISO,and that's all
then just use your psp,choose memory stick and you should be able to see the icon of Gundam Battle Universe(the wallpaper is ex-s gundam),enter it and enjoy the game

usually this kind of problem is related to your psp version,if you are using a hacked one,please change your "PSP Faked Region" to Japan
I don't think the problem is related to your old model('big' psp)since i am using this too