Yep been in touch with Alex F and got this reply.
As my colleague said earlier, we’re currently aware of an issue that’s preventing some users on Curve Black from upgrading to Metal.
However, after further investigation, the workaround will not work in this circumstance, I’m sorry for any confusion or disappointment this may cause.
Hope a workaround is found soon. Mind you with current situation don’t think we would even get them for weeks.