i did try but my psp said "you have version 2.80 so go away coz you dont need to"..well sort of

can i tell it to bog off and do it anyway????
i would like to run the homebrew games and can't on v2.80..
any suggestions as to how i overwrite the higher v2.8???
dave
do i need too??what is this ver 3.03??? can it run homebrew and can i upgrade..?
i really want a nintendo emulator...