Finally, after two weeks, I got my DM4800 working on Big Sur. Disabling SIP and Gatekeeper. I only copied the Firewire kext from High Sierra in Library/Extensions after Codesigning. I followed those instructions: https://www.tascamforums.com/threads/anybody-using-the-new-mac-os-catalina.7187/page-2?_params=Array. Reboot Computer and DM4800. I use a cheap FW PCI Card with TI-Chip. No need to connect via TB. Works fine with the DM. USB and MIDI work perfectly too over 3 Unitor 8 MKII.
Works on Cubase11 Pro, PT, Ableton 11, Logic 10.7.2, and Studio One 5
At least I can use the DM for a while more before buying a new Mixer.
Works on Cubase11 Pro, PT, Ableton 11, Logic 10.7.2, and Studio One 5
At least I can use the DM for a while more before buying a new Mixer.