I had an update and then after that my HDMI port stopped working

Could it be a bad hdmi port on the Xbox? When I changed the settings it just stopped working, it had worked fine until that point

I had the same issue yesterday with my Xbox one I've had it years and never had any issues with it i was able to fix it a really old school way but don't know that this will work for you but it can't hurt to try. after turning on my Xbox one and having no signal i rest my console checked all of my HDMI port's and after still having no signal i unplugged it from power and HDMI and dusted it off and blew Air into the HDMI port. and then plugged everything back in and then turned it on and got a signal

I tried those ports first after my old ports (3+ years of open NAT) stopped working.

I have also tried the Sticky's ports and the ports on the support section of this website.

And somehow all of this started after the latest update. Hmm..

had the same issue i ended up getting a replacement one because the input hdmi stopped working 1st was just once and a while then only worked when i unplugged the hdmi and plugged it back in for would stop working soon after

How many HDMI ports are on your TV? try uising a different port. My Samsung only has one HDMI port that works with 4K and I had to open that port via settings and activate it.