H8000FW FireWire is not supported on macOS11 Big Sur. If relevant, please bear this in mind before upgrading your Mac.
FireWire is heading for obsolescence, and few recent machines support it, so we do not expect this to be a problem.
FireWire is part of the Thunderbolt connection protocol, which in turn is part of the USB-C standard. USB-C isn’t going to go away and is a modern connection that all new Macs come with. A simple adapter is required to connect a FireWire device. Is there any hope that you will ever release an updated H8000FW driver compatible with macOS Big Sur? I am even willing to pay for it and, I think very many would be willing.