Be very, very careful when changing the gameboot. 3.03-OE has very little free space in the flash (where the os is stored), and if the gameboot is too big, you'll brick your psp. But, I think it's only a semi-brick because you can recover from it. Use the latest X-Flash, and read that read-me for the maximum file size.

Usual note: I'm not responsible if you screw up

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