Same here.
Belkin and ikling stopped working with USB mouse and keyboard.
Little single slot USB -> USBc adapter works.
avaddon
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So for anyone updating to Big Sur and using a Razer Synapse 2.0 v1.88.20.
After 4 hrs I've got it working.
After update to Big Sur Synapse was loading for me but was not detecting devices.
manually running
sudo kextload /Library/Extensions/RazerHid.kext
will error suggesting to Approve extension via System Preferences.
3rd Party extension popup and Allow never showed up in a pane.
After digging around and looking up Razer TEAMID R2H967U7J8 I was able to manually adjust security settings: Boot into Recovery Mode - https://support.apple.com/en-us/HT201314
Click the Utilities menu and select Terminal.
Execute the following command:
/usr/sbin/spctl kext-consent add R2H967U7J8
Verify that team got added
/usr/sbin/spctl kext-consent list
Should output something like:
Allowed Team Identifiers:
R2H967U7J8
Close the Terminal app and restart
After this I was able to execute
sudo kextload /Library/Extensions/RazerHid.kext
Got popup and Allow button in System Preferences.
Allowed extension and restarted.
Got my Naga Epic Chroma back in Synapse after reconnecting it.