icy if that is the sony official update.I dont think there is going to be a downgrader for a while. You need to have firmware 1.50 or a custom firmware to play homebrew.Which means that since you have 3.51 you would need to downgrade and as i said before there iis not going to be a downgrader for that firmware for a while.If you just bought your psp and you can take it back or get on on ebay with any firmware lower than 3.51 you can downgrade thanks to the new 3.50 downgrader. But if you cant then i think youre out of luck