I feel like that's a touch a false advertising if restrictions don't exist and you still don't have that feature enabled. is there a way to set the region to someplace else?
Possibly, but you'd have to telnet or ssh in to the router and mess around in the command line interface. It's been reported that the region is locked in to the router and can't be changed.
Since all the XT8 firmwares are on the ASUS site, when I get some time where I can bounce my WIFi up and down for a day, I will try all of them if I can, starting from the first, and see which ones give me the 160Mhz option and which one took it away. I'm starting to think I was hallucinating 160MHz when I first set up the XT8 a couple of months ago.