Now that some 4K channels exist how does upgrading to a 4K box work exactly?

Are you supposed to pay extra or can you exchange current cable boxes for the 4K version for the same current monthly subscription?

I contacted support and they were so confused. Tech support sent me to sales, sales sent me back to tech support and no one knew what to do. I ended up just bailing on them after an hour of my time wasted.

I was told by sales it would cost $5/month more to get 4K, but then they changed their mind and sent me back to tech support to do an exchange.

I was told you can only use one wired 4K box and can't mix with the wireless version. BlueCurve TV Player | Wireless 4K (Xi6) or BlueCurve TV Player | 4K (XG1v4).

If you have multiple 4K TV's do they either have to all use wired or wireless versions of the same 4K box then? Can you have two wired 4K boxes? My current setup is one wired main box and then a wireless box for the other TV the non-4k boxes for Bluesky TV.

Anyone that's made the switch can fill me in on how it actually works?