MacBook Air not recognising XR18 as a sound device?

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Hi, we use the XR18 connected into our Macbook Air for our livestream (into OBS) however the Mac has stopped recognising the XR18 as a sound input. Its listed as a device but doesn't show as active.

I've changed cables, even tried it on a different Macbook which didn't even detect it as being there. We're currently on 1.18 for the firmware, could this be the issue?


Has anyone else had this issue and/or does anywhere know where I can get the earlier firmware versions from? I have seen in other forums that the mac os stopped recognising the XR18 but they got it going using an earlier firmware. I'd rather not downgrade it but if that would get it working again I'll do it! Thanks.