4k TV Cable Boxes

I have Xfinity X1 TV Cable with three TVs connected by three Xfinity boxes (AX013ANM main cable box and two XiD-P boxes).  I understand that these are all maximum 1080p definition.  I’ve started replacing my HD TVs with 4k UHD Sets (most recently a  Samsung 55” neo QLED.  I understand that my current Xfinity configuration will not support 4k so I believe I need to upgrade my boxes.  I’m thinking that I need the following boxes to upgrade to 4k: one XG1v4 main cable box and two satellite 4k Xi6 boxes.  Please let me know if this is correct (the most up-to-date boxes) and how to get the boxes.  Also, advise if it’s a simple procedure in setting them up (I’m 75 years old and no anywhere near a tech expert!).  In addition, should my current Xfinity remote controls be replaced?