Change Wireless X1 TV BOX Arris Xi6

Hello,  About 6 weeks ago I signed up for Xfinity Gigabit Internet service along with X1 service for 2 TVs.  For one of the TVs, they gave me a wireless TV box: Arris Xi6.  I don't like this wireless TV box at all!  It's given me too many problems.  Response of the TV is very slow.  Sometimes the signal drops out or the wireless box goes offline.  Then I have to waste time troubleshooting to try to fix the problem.  There is an active cable box right next to this TV, so I would like to replace the wireless TV box with a wired 4K TV box - the Arris XG1v4.  What is the easiest way to replace my Arris Xi6 TV box with the Arris XG1v4?  Thanks for your help!