check the system info.
It should say what version it is.
usually 2.0 firmware is good cos you can play ISO, homebrew,emulator games on it as 2.0 can be downgraded to version 1.5 firmware to play the above. anything above is crap, what i mean by crap was you can get most of the PSP since you cant play 'pirated' games, and anything above 2.0 CANNOT be downgraded to 1.5 anymore, so to those who upgraded & thinks it has alot of features, think again
GL with sale buddy, good price!