Psp Go! 5g motherboard 6.39 Downgrader to 6.20 PROBELMS

[RevolverRenne]

I have a PSP GO! 05G and a motherboard with a 6.39 Firmware. I downloaded the Downgrader 6.39/6.38 to get to 6.20, but to run the downgrader end I get a message that says "Your PSP model is 5g ... error opening Veryfing SCE you." He points out the location of the downgrader and to end the screen goes black and returns to the XMB me. I have to do??
Tell me about of use instructions because i can't downgrade, i see somes tuts, but do not work...

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[shinigami7th]

2 possible reasons:
- you downloaded the wrong firmware update (non-go and go versions are different)
- your firmware update is corrupted

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