Sadly I think you are right. I'd found some information about firmware, though it was upgrade rather than downgrade. It is the older USB2 camera.

To rule out the Pi or Astroberry, I tried it on my linux laptop and it also failed (including with the FireCapture 2.7beta which has better Zwo support). It looks like I'm not going to be able to leave the world of Windows until I invest in a new camera Even the updated model will be cheaper than a Windows laptop so hopefully Astroberry is still a way forward.

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