Hi !
I have the razer viper ultimate and I did not have any problems until now, if the cable is into the dongle, only the dongle will be recognise, if I plug the charger, the mouse shows up.
I already tried to repair, uninstall and re-install Synapse, reboot my computer, and I do not have another computer to test the mouse in. I also tried to put the usb key directly into my computer and in the dongle and neither works.
can someone help me ?