Xbox One S stopped offering 4K?

This is a strange one indeed, but I"m not sure if there's a way to fix this short of a factory reset.

I had my new Xbox One S in 4k mode, and was playing around with the settings. I went to "advanced" and changed it from "auto-detect" to HDMI (instead of DVI).

It switched me to 640x480 mode, offering up to 1080p manual resolution select. So I switched it back to automatic. Except instead of going back to 4k, like it was before, it went to 1080p. I've done a full shutdown, several reboots, unplugged and replugged the HDMI cable, and it still only lets me pick between 720p and 1080p.

I just simply can't get it to let me select 4K as an option again.

Anyone run into this? When I first set it up, after doing the initial setup where I logged into Xbox Live, it said "your TV supports 4k, use it?" and I said yes. I had switched back and forth between 1080 and 4k a couple times to see if any of my TV's inputs supported the HDR stuff (none do, bah), but somehow going from Auto to HDMI to Auto broke it.

Submitted by drfsupercenter | #Specialdealer Special Offer Online Shopping Store 2016