I have a problem with 5 Ghz wi-fi settings. When i choose Romania (where i am from) in Advanced option, in Basic - Network the 36 channel is not showed as an option in channel choice when choose 80 channel width. Its only Auto option available in channel with 80 channel width, but this option never works as suppose to do. The speed with my Intel dual band AC 7260 have to be 866 Mb/s, but its never showed more than 400 Mb/s in Ethernet status. In Status - Overview page it shows always 36 channel and 40 channel width, even i chose 80 channel width in Basic - Network page. So, my question is, why the 36 channel is not showed as an option if i choose 80 channel width?
I know as a fact that in my country the 36, 40 and 44 (not 48 as it showed in that build) channels are available for 5 Ghz band, so using 80 channel width is possible.
I have a Tenda W1800R router, btw :)