Looking for help on mouse 6th Button

Sep 24, 2018
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So I recently bought an Inland mouse, now this mouse has the normal left, right, and middle button (and scroll) along with 2 side buttons and a button underneath the scroll wheel for a total of 6 buttons. However I cant seem to bind this 6th button no matter what I do! Iv checked for driver updates, tried multiple rebinding applications and still have no luck with it. So my question is, is there a way for me to get this 6th key working? Or my efforts were for naught..

Update: I believe this 6th button may not be an actual for use button and is a DPI Button (Im not sure what that actually means Im assuming it has to do with how fast the mouse's pointer on screen moves because thats what it looks like)
So unless there is a way to remap this button, sorry for wasting your time
 
Solution
It likely is the DPI setting.

https://www.howtogeek.com/182702/mouse-dpi-and-polling-rates-explained-do-they-matter-for-gaming/

That's what DPI is.