i have official 2.81 firmware on my psp, as is stated in system info. i simply wanted to upgrade to 3.30 so i can view full resolution videos that i convert. i've downloaded 4 different copies of 3.30 from different sources. each time, i place them in the psp/game/update folder, then try to update. however, the psp tells me each time that it is 2.60 firmware and there is no need to update. so i go to sony site and download 3.50 firmware and try to update. again, the psp is telling me it's 2.60 firmware and i don't need to update. ???