and no I never "cleaned" my firmware, and i'm not really sure exactly what you mean by that. I just installed it after backing up my memory stick on my PC.
Yesterday 21:04
yeh just to explain it, cleaning is useful if you have themed your psp. simply you upgrade to 2.0 then version thingy it to 1.0 then run sony official 1.5 update to format your firmware and remove themes

things like this can cause bricks if the 3.03 oe-a update doesnt format (im not sure it does so im not willing to risk not cleaning)