I have the same problem as Cavern, (need to upgrade from 2.01 before downgrading) I know that you can get the 2.5 or 2.6 firmware from a few different sites, but they are all US firmware and I have an EUR psp. Also the files that are dumpped from 1.5 firmware, do they also need to be dumpped from an EUR version of the 1.5 firmware or will the dumpped files from the US 1.5 found on psps hacks be ok?