For the majority of users, this issue was fixed by simply changing the USB port. Sometimes it is the port and not the mousepad itself that is causing this error.
How to Fix Razer Firefly Not Showing Up in Synapse? If you’re in a similar situation then here are a few fixes you can follow to troubleshoot this problem. Recently, some users have mentioned that their Razer Firefly is not showing up in Razer Synapse. So, you don’t have to worry about your aim stuttering anymore. It has little friction and the mouse feels like it is gliding over the pad surface. It is an RGB mousepad that you can link with your Synapse configuration tool. You want your aim to be accurate and precise then you should buy Razer Firefly.
A good mousepad is just as important as a good mouse.