The same thing Happened to me, the dongle do not work anymore I’ve been looking for the dongle replacement for a while and is out of stock I just can use the viper v2 pro wired, I was looking for the hyperpolling since I found out that I need the dongle to conect the mouse, Razer support team should send to everyone who bought this mouse a replacement dongle, this problem is happening to a lot of people and the worst thing the make people to post a video truly showing the mouse doesn’t work anymore, I don’t have problem with that, but tha’s the worst letting the other brand knows the new mouse is not working, think smart