I've run in to this exact problem after installing (huge mistake) the new MacOS Big Sur. Only except I'm using the Razer Trinity.
Whilst I followed the guide from avaddon which helped 'detect' the mouse. It failed to let me adjust certain keyboard functions/keybinds. Non-responsive. So in reality, nothing had improved at all.
Can someone explain what: R2H967U7J8 referred to? Is this a particular ID belonging to a particular device?
Any ideas why I am unable to adjust the keys using the keyboard function?
Taztastic
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