If you got it from a certain site ending in a "ISOZ" you need to swap it to SONY NP9660
If you got it elsewhere you won't have this problem, for example from hako, I've found the one there works fine in all versions.
I honestly can't say what they did wrong to have it not work on the other site, but :S
I had the problem on my friend who was too sillly to ever update his PSP from 3.80M33, the problem persists on 3.90 but because it's not a CFW problem, it's a bad dump problem.