4k cable TV box

Greetings,

I just purchased a 4k TV and after looking through the settings on my cable box I have found that it will only output up to 1080p.

I did some research on Xfinity and found that I will need an Xfinity X1 XG1v4 box in order to output at 4k.

I have been unable to find a way to request one of these through my account, and there is a history on this forum of posts where Xfinity support has been able to help.

Can anyone assist?

Thanks.