Hi folks! One alternative to Synapse is Steermouse if your device is compatible. Like everyone here, I wasn’t able to use my brand new Naga trinity wired mice with MacOS. Everything went fine on W10 using bootcamp. As of Big Sur 11.2.3, for getting to use your Razer device with a Synapse 2.0 compatibility, please apply the following steps : Boot on recovery mode (Cmd R), click Utilities menu, then execute : /usr/sbin/spctl kext-consent add R2H967U7J8 where R2H967U7J8 is the Razer TEAMID. You can check it has been successfully added by executing the following command : /usr/sbin/spctl kext-consent list Execute reboot or close the terminal app and restart in normal mode. Then, open your terminal and execute : sudo kmutil load -z -p /Library/Extensions/RazerHid.kext Allow any requirements needed. Restart your system, open Razer Synapse. You may need to disconnect/reconnect your USB device everytime you boot for getting synapse to actually detect your device. All solutions found on this thread : https://developer.apple.com/forums/thread/649829 PS : please Razer, update your software. Selling a product that can't be fully used is not legal in a large number of country.