do not replace flash0 it has signatures that correspond to that psp only!!!!
Flash1 is ok but make sure it is for the same exact firmware your on
EXAMPLE:
3.03OE--->replace with 3.03OE flash1 files
3.40OE--->replace with 3.40OE flash1 files
* i do not recommend doing this with 1.5 you do and you could easily brick your psp with out being able to recover
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