how to generate "SIG check key" for v2 prx ?

on psp FW 2.xx
each psp have different "SIG check key" prx file

how to gen. this key for v2 prx ?

ata.prx software dump from FW2.01 EBOOT.PBP

ata.prx hardware dump from PSP(2.01) NAND Flash

ata.prx hardware dump from PSP(1.51 -> 2.01) NAND Flash

this "key" was gen. by psp when update

so is there have method to gen. this "key"?


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