A few ppl I talk to who downgraded (including myself )there psps from 2.5/2.6 to 1.5 use a program runumd ( i am not talking about isos here so please dont ban me i trying to make a point here) it seems on downgraded psps runumd will not work through loaders or on its own meaning there is something wrong with the flash its not 100% so its not final in my opinion. I dont know if Dark_Alex is aware of this problem and it can prob be fixed with upgrade to 2.0 then back down again but the point is why dont it work? is there something wrong with the downgrade? Please can somebody who knows about this crap look into it there is a lot of people with the same prob. This program I use for booting up some of my games that need higher firmware..