Hallo okliv, thank you for a next description how to work to fix the problem. Your description works fine till I type in sudo /usr/bin/kmutil load -p /Library/Extensions/RazerHid.kext. I will get the prompt dialog again (like first time running), but at the system settings I see the behavior that there is NO ALLOW button...

I give up. My first try to go on with the description from @avaddon it worked fine. But then I installed Big Sur completely new and I cannot repeat the success. I get always the answer: Extension with identifiers com.razer.common.razerhid not approved to load. Please approve using System Preferences.

Hallo guys, I am desperate. At my first update from Catalina to Big Sur the procedure from @avaddon worked fine. Because of other problems I had I decided me to make a complete fresh new installation to my iMac of Big Sur. And now, I have the problem that the procedure from @avaddon does not work any more. The registration of R2H967U7J8 in the Recovery Mode did work. If I enter /usr/sbin/spctl kext-consent list I get the expected answer. But after restart when I enter the command sudo kextload /Library/Extensions/RazerHid.kext I get all times this answer: Extension with identifiers com.razer.common.razerhid not approved to load. Please approve using System Preferences. And there is NOT coming the popup and Allow button in System Preferences. The Synapse shows me all times the message, PLEASE CONNECT A RAZER SYNAPSE ENABLED DEVICE. A restart of the computer and dis- and reconnecting of USB-Port does not help. Any ideas what to do further? Thanks and regards

Hallo avaddon, yes your way works. Great and thank you. But in my case when I restart or power on my iMac and start up, the Synapse software does not see all my devices again and shows the message "please plug in a Synapse possible device". I need all times to disconnect and reconnect the devices from the USB ports. Then Synapse works and shows all devices again. But that is not the way to do this all day... Is there a fix possible that Synapse works at all start up situations? Regards