Razer Viper Ultimate Dongle | Razer Insider
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Is anyone else having issues with their mouse not updating or working? I connect with the cable and synapse 3 recognizes it, but when I input the dongle nothing works and the pointer won't even move
Check dongle on other PC (without Synapse installed).

Also you can check if it's detected in OS (device manager). If yes, try Razer pairing utility tool: https://mysupport.razer.com/app/answers/detail/a_id/4868/~/how-to-use-the-razer-mouse-pairing-utility