Hi,
I use EyeTV 4.0.0 (8524) and an old elgato eyetv 320 with Firewire connection here.
On macOS "Catalina" works very fine. But now on macOS "Big Sur" EyeTV 4 crash my iMac with kernel panic if I use my old eyetv 320 device. This is reproduce here.
I use Apple original Thunderbold to Firewire adapter.
What's problem?