For you U.P that flash your chips often using USB, please be very careful. See when you flash it for a few seconds and the bars jump fromr 1 to 3. That means its supposed to READ your id storage but it doesn't.
FreePlay who just got his U.P and it froze between these bars and WROTE to his id storage and ****ed it. HE can' t read UMD's or Network etc. Please becareful writing to your U.P using the U.P flasher as it can totally **** up your psp.
But this means you can write to id storage and fix it, I know a few developers working on this :)
So please becareful!