Does anyone know how to fix this? If so please tell me.

FoxDudle120
So I got the Blackshark V2's like a year ago. At the start the surround sound worked just fine. A couple months later, I turned it on. I went to my sound settings to switch to Surround sound but the 7.1 Surround sound option didn't appear. And it still doesn't.
Does anyone know how to fix this? If so please tell me.
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