sorry I'm not sure why my last line was in a headline form, I can't seem to change it.

In reply to Clouzeau, this gives me hope of being able to use my new Mac Mini M1 with my 5Big TB2 on Big Sur. I am not a developer, I am a photographer with heaps of media assets on the 5Big that I cannot access at the moment. I have reached out to LaCie help desk by email but their help has been ultra basic and nothing that I haven't found myself by searching. They now say that the 5Big TB2 is not compatible with the M1, but your post gives me hope. Your instructions have given me a roadblock though. I open Terminal, type in sudo su and then it prompts me for a password. I type in my Apple password but it doesn't let me in. Then I searched further and found I could change my password which I did. Then I typed cd /Library/Extensions but then I got this message :   No such file or directory sh-3.2Is there something else I can try?