Wiring diagram for Kotion each G9000?

Wiring diagram for Kotion each G9000?
The mic has stopped working on my Kotion EaCH headset. I cannot find a diagram anywhere. It’s on a 4 pole jack but there are only 3 wires: blue, green, and copper (assumed ground). I want to replace end but I don’t know which wire is the mic. Help?

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