How to update Hayabusa supergun- advise needed

Dagga360

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Hi
Recently picked up a Beharbros Hayabusa supergun, but i think its the original one with old firmware.
It will only recognise official PS1 controllers, and apparently there is a lag issue.
I've tried contacting makers, but no response
I know where to get the firmware and I just got hold of a USBASP needed to do
but after that I'm lost.
I assume the USBASP goes from PC USB and i have to put dupont leads on the correct pin to pin on the supergun

does it need to powered at this point?
never done this before

any ideas?
 
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