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Hi,
I have a TP-LINK1350 Archer C60.
I'm trying to change the 5GHz wireless network channel to 100+ (140, 157 something like this.)
However, the channel selection drop down menu have only 4 options (36, 40, 44 or 48)! how can I select a channel above 100.

notes:
- I checked a WiFi analyzer and found that all 4 channels above are already in use in my area, so i need something 100+
- checked for updates for the router, it already have the latest version (V2 Build 20161206).

thanks