Switching cable boxes to 4K

We have four boxes, two 4K XG1v4 DVRs and two of the little satellite boxes.  So, you can definitely mix and match, but not sure how Xfinity decides which box is the "main" one.  

Hello, @user_c3e261 thank you for taking time to create a post. You've contacted the right place for assistance, and I definitely want to help answer your questions so you can enjoy the best quality picture on your new 4K TV's. Here is a great article that goes over 4K content and the set-top boxes needed. : https://www.xfinity.com/support/store-selector. 

Based on the information you have provided, the main set-top box would need to be upgrade to a 4K DVR box as all the other equipment in the house receives their broadcast signal from that piece of equipment. For any secondary 4K TVs the wireless 4K boxes would be sufficient if you don't need 2 DVRs in the home. The best option for you would be to have the main set-top box attached to one of the 4K TVs, get the 4K wireless for the 2nd 4K TV. Move one of your current secondary boxes to the 1080 TV, then return the old main cable box and the box the other 4K box is replacing. 

With having to return 2 boxes with the replacements, the easy way is to check if there is a local Xfinity Store in the area, set up an appointment to save time, then take the 2 boxes with you to swap out: https://www.xfinity.com/support/store-selector. There are some great walkthrough articles on activating your getting started kit on our website: https://www.xfinity.com/support/articles/how-to-install-your-self-install-kit-devices.  

We can also ship out equipment, but wanted to set up the proper expectations that there can be a shipping and handling charge when processing orders. Once you receive the shipped equipment, there are a few great options to chose from for equipment return: https://www.xfinity.com/support/articles/returning-your-equipment. If you need to swap equipment out, and want to place an order to ship please let me know.